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Chatoyant Stone

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Mark
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« on: September 30, 2009, 05:22:42 am »

Chatoyant stones are some of the most interesting and beautiful of the semi precious stones.  The group of chatoyant stones includes such well known stones as Tiger Eye, Marra Mamba, Pietersite, Binghamite, Silk Stone, and varieties of common semiprecious stones like Malachite, Jade, and Obsidian.  Chatoyant stones are those that can change in luster or color by orienting them differently to a light source.  It is also what causes the Tiger Eye property which is a reflected streak of light from a chatoyant stone that is cut and polished into a cabachon.  Next, I'll post some examples.

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Mark
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« Reply #1 on: September 30, 2009, 05:52:46 am »

Here's more pics.

Mark

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« Reply #2 on: September 30, 2009, 03:46:07 pm »

Excellent job getting us started off Mark..

I will be back to share some chatoyant material too !

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« Reply #3 on: September 30, 2009, 04:09:12 pm »

This is wonderful idea:) These stones are my all time favorites:)
I got some to post too as soon as my battery gets charged up.
Would Labradorite go in here too?
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« Reply #4 on: September 30, 2009, 05:10:16 pm »

Labradorite is strongly iridescent and I've seen one definition of Chatoyant that said iridescent.  I would lump it in with the rest of the chatoyant stones.  I think Binghamite and Silkstone are very iridescent so Labradorite should fit right in.

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« Reply #5 on: September 30, 2009, 05:25:49 pm »

Pietersite, Mark that is one very nice specimen, from the picture, it looks huge.
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« Reply #6 on: September 30, 2009, 05:51:59 pm »

Great job Mark, now box up all of those examples and get them shipped to me!!!


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« Reply #7 on: September 30, 2009, 06:32:03 pm »

That first piece of Pietersite is about hand size, but its a really weird shape.  It is a corner of a cube that had a circular core drilled out to make a sphere.  I see Piertersite sold like that reasonably often.  It makes a really strange shaped chunk that will be hard to slab.  So far its just a display piece in my collection.  The golden yellow piece is small, like quarter size.  The last piece is half way between the other two.  Pietersite is one of my favorites.  I love the black with the iridescent blue and the gold / yellow, the best.  The black /  blue stuff is from Africa and the Yellow is from China.  There are differences in make up.

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« Reply #8 on: September 30, 2009, 10:44:36 pm »

I see the Pietersite sold like your talking about a lot too Mark.. I have bought some and it is awkward to slab.

I do like the blues in it the best, although the African that comes with the nicest of blues is quite a bit more expensive.

One neat chatoyant material is this Feather Malachite. Going to try and share a cab to go along with each of the slab/rough pics to help show some of the chatoyant effects.

Although this first Feather Malachite cab is not the best example...

   


Alexanderite, and darn if I can find a single cab pic !



Mark has already shared some Pietersite, but here are a couple more. The one to the right with all the beautiful blues, had to return as it was so badly fracture.. Very disappointed.. Really wanted to tackle those blues !


   

Marra Mamba Jasper slab behind the cab.




More to share later !

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« Reply #9 on: October 01, 2009, 12:32:08 am »

i have rough, but not as nice as this cab by Mitch i got years ago. I will update with rough pics when camera working again.

AZ tiger Eye, better known as Chrysotile in Serpentine. more common than you think. At least that general form, the AZ stuff has been pretty well played out.


* aztigereye.jpg (66.68 KB, 648x916 - viewed 70 times.)
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« Reply #10 on: October 01, 2009, 03:34:31 am »

Shain, that is a beauty.  I bought some cabs from the big rock show a couple years ago that the guy told me were Chrysotile.  This was a far east company, probably from china.  The cabs were really big and badly done and cheap.  So i bought a few to bring home and recab because of the nice colors and patterns.  They were a whitish green color with blackish streaks, not at all like your chrysotile in serpentine.  Still they were pretty cool, I just with i knew what the real name of the stuff was.  I will have to see if i can find some of the stuff from AZ, very nice.

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« Reply #11 on: October 01, 2009, 03:35:53 am »

George, I have some brown with gold ribbon like pieces in it that is very fractured.  But cabs from it actually look pretty good.  I'll check and see if i have any pics around work.

Mark
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« Reply #12 on: October 01, 2009, 05:07:57 am »

Love that cab Shain !
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« Reply #13 on: October 01, 2009, 06:55:45 am »

Fantastic cabs George, Love that MarraMumba:) I hope the one I have will turn out that wonderful:)
Shain that AZ tiger eye is superb. I have never seen anthing like that but its on my want list now:) Love the cut on it. Very daring and spectacular:)
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« Reply #14 on: October 02, 2009, 03:34:01 pm »

African Tiger Eye- more red than yellow - one on right has both red and yellow
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« Reply #15 on: October 02, 2009, 03:36:48 pm »

MarraMumba - Piece de Resistance:)
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« Reply #16 on: October 02, 2009, 03:39:21 pm »

Bronzite
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« Reply #17 on: October 02, 2009, 03:49:03 pm »

Labradorite - dang it you cant really see all the fire in this piece. that white upper right spot is full of light:)
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« Reply #18 on: October 02, 2009, 04:59:31 pm »

Beautiful MarraMumba !
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« Reply #19 on: October 08, 2009, 08:52:28 pm »

Here's another example of AZ Tigers Eye.  Not as lovely as Shane's example, but you can see the resemblance to tiger's eye a bit more:

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« Reply #20 on: October 09, 2009, 03:42:03 am »

Connie, nice cab.  I had heard of Tiger Eye from AZ and a few other places, but had never seen it.  Its definitely a nice stone.  Binghamite from the Cayunga Iron Range of Minnesota is also know as American Tiger Eye.

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« Reply #21 on: October 11, 2009, 09:16:19 pm »

a couple of years ago I took a photo of African Pietersite through a mircoscope here are the photos.


* rock1.jpg (307.15 KB, 2776x2074 - viewed 54 times.)

* rock3.jpg (302.89 KB, 2776x2074 - viewed 55 times.)
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« Reply #22 on: October 11, 2009, 10:57:15 pm »

I recognize the one pic from the landing page of your site..

Nice pics... !
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« Reply #23 on: October 12, 2009, 07:48:07 am »

Cool Pics.  I love really busy Pietersite with swaths of color here and there.  The bright gold colors just glow and jump out at you.  Someday I am going to get a piece of the mostly golden stuff, that is cabbable.  I have a few small golden pieces, but they are rather misshapen and really hard to work with.

Mark
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« Reply #24 on: October 12, 2009, 08:31:40 am »

  Hey Sara,  i'm cabbing a slab of Labradorite that looks very similar to yours. It's been sitting in my slab box for months and nows it's on the stick. There's lotsa flash and it carves like butter. Anybody know if this material takes a polish?    


* labradorite slab.JPG (44.39 KB, 640x480 - viewed 45 times.)
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« Reply #25 on: October 12, 2009, 09:45:11 am »

Here is a photo of a pietersite cab that I did about a year ago.
Bob
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« Reply #26 on: October 12, 2009, 10:03:36 am »

Now that's the Golden Pietersite I was talking about.  Exquisite cab Bob.  About half Gold and half Blue.

Mark
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« Reply #27 on: October 16, 2009, 07:42:12 pm »

Hey Jon Jon:) Get it cabbed...LOL
your labradorite has more fire than mine and I cant wait to see how it turns out.
I saw a setting one time in a brushed silver pendant blank and it was fantastic.
I will send you one of the blanks if you havent done anything with it yet. I think you will like it:)

Bobby:) Is there no end to the magnificence and magnitude of your treasure trove??? Yet another breath taking design and stone.
I love this place I get to see all these fantastic stones I would have never seen otherwise. I love these natural rocks much more than anything I see in diamonds.
Diamonds are boring comparded to what yall show us:)
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« Reply #28 on: October 19, 2009, 02:20:09 pm »

just to keep debates alive. and not to say anyones wrong. But Labradorite produces what is called a "Pleiocortic" effect, and it not consider "Chatoyant", or have Chatoyancey"  

Pilocortic effect has to do with a similar idea as Chatoyant, and in essese is about crystal formation on a small level. Which has a effect on the play of light.  But if you look closely, Stones that are chatoyant have fibers to them, or are generally fiberous looking. Stones that have the pleocrotic effect have more tables of color, similar to opals.

Now, my spelling is terrible and i can only find one gem reference to the term "pleocrotic", but it is a known effect in feldspar based stones. IN which Labradorite is part of that family. As is moonstone, sunstone, Nummite, Larinite, spectrolite and more im sure.
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« Reply #29 on: October 19, 2009, 02:32:16 pm »

Shain you are right.  As with many other ways of classifying rocks, people tend to place stones in groups with other similar stones.  Like you said, the effects are similar, but they are caused by different things.  To the rock specialist, that would be a no no, but to most of the rest of us amateurs, that is what we do.  I tend to think of Nuumite as being rather fibrous.  It seems to be made up of dark fibers that are interspersed with the reflective an kind of iridescent green, gold, or silver metallic fibers.

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« Reply #30 on: October 19, 2009, 02:44:04 pm »

Isnt Nummite have two driections? Like plates ? One way that flash, the other way they look like intersecting fibers?
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« Reply #31 on: October 19, 2009, 03:45:57 pm »

Nuumite has at least two different views, depending on the orientation of the stone to the light source.  One way shows off the iridescent view with the metallic looking threads, while the other gives a more flat and homogenous look.

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« Reply #32 on: October 19, 2009, 03:51:06 pm »

Do you have a nuumite to show us please?
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« Reply #33 on: October 19, 2009, 06:29:46 pm »

I do, but it will take a bit to find it and photo it.  I can't really use my right arm at all tonight, it has gotten much worse.  I am guessing that something is really torn and the doc was wrong.  Tomorrow i may have to go see an Orthopedic Surgeon.  

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« Reply #34 on: October 20, 2009, 05:13:59 pm »

I understand that a hobbyist tends to just like, vers knowning more about what it is they like. But all to often, it further confuses the newer or younger hobbyist which then often results in mis-information. Then comes the hobbyist sellers using this mis information to market items that are not what they are, and often for more than they are really worth.  

This is my stance on many of my replies to topics or post in this forum and others. if people only want information that suites them, they will rarley hear that from me.

Nuummite is formed of  Anthophyllite and Gedrite. Both which form Orthorhombic mineral structures. These structures do not make threads or needles, but rather thin tabs or plates.  The two driections am i talking about shows these tabs insecting. Resulting in either flat plate/tabs to the eye, or thin threads. But those threads are just the y axis we are seeing of the structure which is a thin plate.

Sorry for ball busting, but its what i do when still mostly what i see is misinformation. Hope your arm gets better.
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« Reply #35 on: October 20, 2009, 07:00:20 pm »

Shain, thank you. I am here to learn and hopefully not to look too much the fool.
I will do more research but if you can show some examples I would greatly appreciate your time and knowledge.
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« Reply #36 on: October 20, 2009, 07:38:07 pm »

I agree Shain. That is why I did not put any pictures in on this one.
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« Reply #37 on: October 21, 2009, 07:52:43 am »

Shain and Seth I have been picking up before now that you get upset by the postings. If I am the problem let me know and I will go about my business.
Everyone of us on this forum wants to learn and if you see something that needs more clarification why dont you tell us or show us? I would greatly appreciate it and I know others would too. There are some super intelligent people on this forum who know more about stones that I would ever understand in my lifetime. And never has anyone tried to force their opinion on anyone else or pretend to be a know it all.
I like to learn, its what makes life interesting. 
If there is something that offends you why dont you tell us and if something needs removal or changing or more clarification then tell us. George set this whole forum up for a learning, teaching, sharing good experience.
Nothing drives me nuts more than someone saying they know something but I am not important enough for them to tell me. That offends me.
Seth, I know you and Shain have some wonderful knowledge and stones to share and I would be honored and thankful if you would share with me.
Sincerely,
Sara, Warrior Princess of "I know more than you but you dont ask the right questions so you dont need to know syndrome"...
Ousted Princess of Keep your mouth shut kingdom:)
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« Reply #38 on: October 21, 2009, 10:37:58 am »

Sara, you are not the problem.

I have been very torn (and not just my shoulder), as to whether to respond to a couple of posts or not.  And since I am in a lot of pain and a bad mood, I am gonna respond.  Maybe I am wrong, but I’m taking it kinda personal and I feel a bit insulted.  I have been accused of misinforming this board and some may even read into that I have done it purposely, if I am to be included in the group of “hobbyist sellers” that use misinformation to market items for more than they are worth.

Quote
Sorry for ball busting, but its what i do when still mostly what i see is misinformation.

Quote
I understand that a hobbyist tends to just like, vers knowning more about what it is they like. But all to often, it further confuses the newer or younger hobbyist which then often results in mis-information. Then comes the hobbyist sellers using this mis information to market items that are not what they are, and often for more than they are really worth.

I am here to both learn and to help others.  I have never knowingly misled others and I am certainly not here to misrepresent stones to get more money for them.  I know most of the scientific mumbo jumbo about these stones.  I am a voracious reader when it comes to something I am interested in.  For the most part, I don't think most people care whether it was this property or that property that caused a stone's chatoyancy, just that it is chatoyant.  People that do care, go out and do research and find the causes of that property and will see that there can be several reasons why a stone is chatoyant.  I try to explain things in common terms that will make sense to the most people, and to tell the truth, I don't remember the exact scientific term for each property that causes a stone's look and feel.  I knew them, and then forgot their names, but I am still familiar with the property. 

This thread was started to highlight a group of stones that have a specific property and to start a discussion on them and to show examples of them.  Chatoyancy and iridescence are properties applied to stones that describe how the luster and/or colors change depending on the angle that you are viewing a stone.  A couple definitions are in order.  Iridescent = a play of lustrous, changing colors.  Chatoyant = changing in luster or color.  Sounds pretty much the same.  There are quite a few stones that can fall under this category depending on how strict your interpretation.  Many of them have already been named and pictures presented.  There is some question as to whether Labradorite or Nuumite are chatoyant.  Maybe you should all be the judges.  If you have a slab or cab of Labradorite or Nuumite in your hand, and you turn the stone so that you see it from different angles, does the color and intensity of the color change?  They sure do at my house.  Now per the definitions of Iridescence and Chatoyance, these two stones sure seem to fit in this category.  What may be the issue here is not that they are chatoyant, but why they are chatoyant.  Labradorite has a property called birefringence.  Basically it is doubly refracted which means that light can go into it and be split into 2 different light rays that come back out at different speeds.   I believe that this is what causes Labradorite to change as you view it at different angles.  I don’t remember the mechanism for Nuumite, but it also changes color and intensity as you view it at different angles.   Also with Nuumite, I have seen what I will call threads.  These are long, thin, and metallic looking.  They are not hair like, they are rather more like small thin ribbons.   I  have some Golden Pietersite with very similar constructs. 

So that’s it.  You can each be the judge of what is Chatoyant and what isn’t.  There are often a variety of definitions, theories, and embedded beliefs of one thing or another in our Lapidary world.  Each one of has their own opinions and beliefs.  You now know mine with respect to Chatoyancy.

Mark
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« Reply #39 on: October 21, 2009, 11:03:26 am »

Sara, I have never claimed to know more than anyone else does about rocks nor have I ever hinted it any place on this forum. I think what Shain stated was clear and to the point. If you see something hidden there oh well. Another thing is I reserve the right to agree or disagree with anything I like with or without your approval.
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« Reply #40 on: October 21, 2009, 01:47:02 pm »

My dear Seth:)
I have seen posts where it looked like you are disgusted by what was said. Maybe even spit on the floor, I dunno its hard to pick up emotions from just words.
All I was asking very politely and I assure you I am always polite, is if you have a problem why not just say what it is.  I dont think there are any unreasonable people on this forum. I enjoy people greatly and I learn something from each one I come in contact with.
I am kinda clueless and not too bright. I am a blonde indian:) Nevertheless I did ask for clarification on Shain's post. I believe in research and I love to read. And I could prolly find all I ever needed to know from researching the stones myself. But isnt it more fun to talk to someone that has one and get their opinion and find out where they got the stone and how they cut it and why?
As for agreeing or disagreeing with me and my approval....lololololololol, sorry that was funny.
None of my exs ever agreed with anything I said and did it bother me??? Heck no but I do have a number of speed bumps in my driveway:)
And, my dear Seth, if you play your cards right you can be my new hubby:)
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« Reply #41 on: October 21, 2009, 02:25:06 pm »

Sara, this is the last post I will make on this subject. I agreed with Shain bottom line. My post was clear and in english. It is rare that I see something I really don't like here. If and when I do say something about it again in simple english. If you did not understand it the person that I said it to did. You said above that you were not that bright. I am sorry for that but there is nothing I can do about it.
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« Reply #42 on: October 21, 2009, 04:05:59 pm »

takes all her dirty laundry off the line to include her flour sack bloomers:)
Mister Seth and I had a meeting of the minds and we decided to be friends:)
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« Reply #43 on: October 21, 2009, 04:14:58 pm »

I get that we are all human.. It is our nature on occasion for each of us to show our little humanoid character defects.

I learned long ago the importance of understanding there is a difference between a persons behavior and the kind of person they truly are.

Much more difficult to do online. As the occasional change in tone of voice, or not being able to pick up on body language leaves a person to concentrate a little harder on reading between the lines.. Trying sometimes to even place ourselves in the other persons shoes in an effort to understand their point of view better..

Sometimes it can be a bit trying though....

Rather than feeling the need to be "sorry for ball busting". Why do it ? Ball busting or belittling people because we are not geologists does not shed any light on a chatoyant mineral discussion. The majority of members here are in fact hobbyist with varying degrees of knowledge.

"Misinformation" sounds so .... intentional.  I have never seen anyone here intentionally mislead anyone. Rather what I constantly see is simple, inquisitive desire learn from those with more knowledge and or expertise.

Then I read responses from Mark and Sara.. Responding as best they can in an effort to both learn more, and at the same time smoothing out the negativity as best they can. Trying to turn the discussion into a positive one.

The discussion about Nummite being chatoyant or not is a perfectly fair one. What is the crisis to the newcomer ? Similar learning instances are brought up on here all the time. We talk about them, share some info, pics, references, etc...

Why would you not want to share your perspective if you have one ? Maybe a pic or two for comparison or to add to the discussion. Rather than just feed into the negativity with short meaningless and non contributing attitude.

The crisis to the newcomer is the negativity. The hint that they may not be good enough or smart enough to participate here. That they should bite their tongue for fear they may be labeled.

When in fact, it is the newcomer who is most important ! No matter the degree of their hobbyist status.


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« Reply #44 on: October 21, 2009, 04:51:40 pm »

My post was made due to the fact that I have many, chatoyant, reflective, feldspar, shining, shiller and so on so it can get confusing. I have made posts of other rough here and people change the whole thread and show or say something about another material that has nothing to do with the original post. So in no way I wanted to put pictures on that one. Gets kind of old when you try and show material and the subject gets changed.
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« Reply #45 on: October 21, 2009, 04:59:52 pm »

Well put George.  I totally agree.  I am actually one of the nicest people you would ever meet.  I was brought up to be polite, hold doors for people, and to give up my seat for my elders.  But I also don't take things lying down.  I totally agree with you about "misinformation".  In today's world, that term has a very negative and intentional connotation.  That really set me off.  I will go out of my way to help anyone here.  I had a wonderful group of dealers, collectors, lapidarists, and jewelers to help me out.  They showed me generosity that i never knew from another group of people and i try to carry on that way.  I will never belittle anyone here for a lack of knowledge.  Please if anyone has a question, I would go out of my way to help answer it and not judge you on it at all.  I am still a beginner in many ways and still have a ton to learn.  I have learned a lot from the members of the board and will try my best to always return the favor.  I am not a know it all and i often make mistakes.  I also think that humor is one of the more important human traits and in this world that we live in, its a necessity to keep from going insane or dying of a coronary.  Anytime someone has a question and is too embarrassed to ask it on the board, instant message (IM) me and i will get back to you and do my best to help you.  Just click on my name and go to the bottom of my page and "send member an instant message" or something like that.  I also know a bit about computers, specimen collecting, and military weapon systems.  

Mark
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« Reply #46 on: October 21, 2009, 06:46:08 pm »

yells... Group hug:) winks at Paula:)
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« Reply #47 on: October 21, 2009, 06:54:10 pm »

Group hugs are always good  ;D
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« Reply #48 on: October 21, 2009, 09:38:29 pm »

   i enjoy chatoyant stones for their peaceful and enlightening qualities....words are fascinating...
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« Reply #49 on: October 22, 2009, 10:15:05 am »

Amo le rocce, tutti i generi di rocce particolarmente quelle Chatoyant.

Damn I posted this on the wrong forum didn't I????  ;D

Arrivederci
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« Reply #50 on: October 22, 2009, 12:32:28 pm »

ok let me give this a shot..... i am fluent in 14 words:P

Amo le rocce, tutti i generi di rocce particolarmente quelle Chatoyant

"I love the rocks...it dont matter if they are plain or fancy, I am not particular and I really like Chatoyant."

Throws a baguette at Steel and stone as he saunders out of the room to get in his coup de ville..
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« Reply #51 on: October 27, 2009, 03:22:27 pm »

my time is short, i do not reflect my emotions in my posts. They are to the point,(as much as it can be). Forums are here online for discussion of informations. Wether that info is misleading or not. Every member has the right to voice they're information.  If my my post imply driect accusations then i will shut up and leave. But they dont, they are to the point and not inflated. I am sorry but my camera/photo access is even more limited than my internet access. I am not able to readily show photo examples.

I am not here to make anyone angry nor am i offended when my posts come off as stern.  I am just providing what info i can to the subject of my interests. On limited time (and patenice sometimes)

Mark, i am not accussing you are providing misinforming to the members of this forum. But rather tryin to keep info on track to the provided thread. Its extemely common for info in forum threads to go away from the driection of intention.  And there is always a member or two that will stand by that info, simply to make a point. We are those members in this stance. nothing more.

George, if ball busting is belittling, i will be qiute and go my way. Sorry if you feel that way but its about keeping info on track. Let me ask then, would Mica be Chatoyant? Think about how that info can be classified to a hobbyist. Now think about how that info is used by both novice and professional sellers. I can atest i've seen mis-information used by many over seas sellers in which that info was generated from a popular lapidary fourm/s.  If The classification of Chatoyant is loose, in less than a year that info will be repeated online by the unknonwing. Simply because they read it online.
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« Reply #52 on: October 28, 2009, 05:44:23 am »

Aqua Victoria Stone.  A manmade stone which the inventor took the secret of, to his grave.  There is a very limited supply of this stuff left in collectors hands and it is quite expensive.  Its pattern and color will change as you change your angle of view.  It is translucent and easy to work with.  It was produced in roughly 2 dozen different colors.

Mark


* Victoria Stone - Aqua slabs 1.JPG (169 KB, 1024x683 - viewed 97 times.)

* Victoria Stone - Aqua slabs 2.JPG (29.73 KB, 448x299 - viewed 67 times.)

* Victoria Stone - Aqua slabs 3.JPG (32.2 KB, 448x299 - viewed 66 times.)
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« Reply #53 on: October 28, 2009, 11:33:30 am »

Very nice... 

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« Reply #54 on: October 28, 2009, 11:44:34 am »

I would really love to have more, and various colors.  There are some cabbers that really concentrate on this stuff and make incredible cabs.  I have a small misshapen piece of yellow and yellowish green.

Mark
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« Reply #55 on: July 08, 2012, 02:35:49 am »

Great thread Mark!

This "type" or "class" of material is by far my favorite to work with.

Thought I would add a Labradorite to the collection of pics (please overlook the workmanship) one of my first but favorites.






and a pic of various spectrums.



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« Reply #56 on: July 08, 2012, 06:43:36 am »

Very kool Carelton.  I love how you faceted the cab or what to call it now since it doesn't fit the definition of a cab.  Anyways, very nice and the colors really pop.

Mark
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« Reply #57 on: July 08, 2012, 11:50:50 am »

This thread kinda made me cring when I read back through it. LOLOL Never a loss for words am I:)
Train kept a rollin all night long....
I miss Seth too. He was very good artist and had some beautiful designs and stones and knowledge to share.
He is another one that just got up and walked off into the sunset one day.
But it turned out all right cause at the end of this post there was a beautiful rainbow that Carleton made just for me:) (I am pretending you did) :)
I am drawn to your pendant Carleton. It is very beautiful.
I got a little triangle cab of Labradorite that I made (yes I have made some cabs believe it or not) that has the upper blue color but all those other colors are so powerful and so bewitching.. They make me smile:)

I think that Nuummite stone comes from Greenland doesn't it? I wrote a story using it as a gift one time.  It represented the essence of how I perceived the person.  
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« Reply #58 on: July 08, 2012, 01:25:39 pm »

lol, yep.

I read the thread start to finish :) at one point I was not sure I should, then felt I should, then should not, then.... lol.

Mark's final statement was well spoken so there you have it. I will be sure to try and take a sequence shot of my labs from now on and show the transition, the above one was the closest to that I had in pic form.

Carleton
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« Reply #59 on: July 08, 2012, 02:49:26 pm »

Perhaps Carleton you should just skip over when you see my name:) It will save you a lotta time and trouble.  I have been tole I could wear the hair off a dog but I cant hep it I was born this way:)
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« Reply #60 on: July 11, 2012, 11:10:12 am »

I like this topic. I think tiger eye and peitiersite are fairly easy to take a polish. I didn't do very well on the mara mamba. mabe it was the particular piece. Seems like I read there are asbestos fibers (or they were) and when polishing you can pull the fibers if you polish to much or get it to hot. I do enjoy working with material that has chatoyancy (sheen) when I can't pronounce it or they look at me funny when I say it.

here's a few pics of tiger eye and one of mara mamba. See if you can see Jesus with sun glasses on the mara mamba, no offense Jesus I love you.


* P7111750.JPG (297.35 KB, 1280x960 - viewed 20 times.)

* P7111749.JPG (316.45 KB, 1280x960 - viewed 22 times.)

* P7111759.JPG (278.98 KB, 1280x960 - viewed 17 times.)

* P7111756.JPG (359.14 KB, 1280x960 - viewed 21 times.)
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« Reply #61 on: July 11, 2012, 11:59:51 am »

Like Jesus back in the 60's I love him too:)
Love your rocks Stew:)
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« Reply #62 on: July 11, 2012, 12:22:21 pm »

Thanks, I think I was having a flash back dancer5
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« Reply #63 on: July 12, 2012, 06:14:18 am »

I am always really optimistic when starting to cab tiger eye and marra mamba, but i am usually disappointed by the results.  The polish on these stones is really dependent on the quality of the rough / slab.  After polishing, there is often a haze or just basic lack of quality.  I know there is some good stuff out there, but its really hard to tell what will turn out well.

Side note: i just cabbed some chatoyant malachite last weekend.  I have seen it listed before for sale and thought it looked a bit different from the regular cuts of malachite.  I got some small slabs and though they are very soft to cab, they really are chatoyant and seem to take a decent shine.  When polished, they tend to look like green Victoria Stone, maybe chatoyant stone is one of the secret ingredients of the Victoria Stone lost secret formula.  I'll try to get some pics up as time allows.

Mark
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« Reply #64 on: July 12, 2012, 08:31:00 am »

Mark, you said Victoria Stone is a  manmade stone which the inventor took the secret of, to his grave.  There is a very limited supply of this stuff left in collectors hands and it is quite expensive.

The supply never seems to run out.  I see it at all the shows could it be just a rumor that it is in short supply to jack up the price?
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« Reply #65 on: July 12, 2012, 11:29:47 am »

I'm getting a lot out of this discussion. I never heard of feather malichite, very nice piece George posted.
looking forward to those pics, mark. your work is very inspiring. Like wise gjones, I saw those four you posted.

After I get over my opal buying spree I definatly going to be looking at getting some victoria stone and feather malichite. I guess the shows are the best place to get rough although I have seen good web sites.
haveaniceday2
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« Reply #66 on: July 14, 2012, 10:23:37 am »

The Doc is dead and did take the secret to the grave with him.  Dr. Imori died without spilling the beans or rather stone on the process and no one has been able to duplicate it. There is only a limited and nonreplenishable supply and that is why it is quite expensive.  I wish i had a boule of each color to put aside for retirement, well, maybe 6 boules.  One for my master, one for the maid, and don't forget the little boy that lives down the lane, oh heck with the little boy and my wife (master) would kick my butt if i gave the maid anything more than a terse hello.  So all for me, ha, ha, ha, ha, ha, ha, ....................................

Malachite is pretty easy to get as shows, a ton comes from Africa and really cheap.  Last year at the Big East Coast Show i got several Malachite and Botswana cabs for next to nothing and i bought several of those malachite chunks that they polish up and sell like paperweights.  I always figured that when i got tired of the malachite paper weights sitting out, i could take them downstairs and slab them, they are that cheap and usually have the really cool patterns.  I have been waiting for the big east show, now if i only had some money.  Hey!  Anyone looking for a lapidary personal buyer who just works for spare slabs and cabs?  I have very discriminating taste and an eye for the strange, unusual, and incredibly expensive.

Mark
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« Reply #67 on: August 02, 2012, 07:44:13 am »

I thought maybe this was a good place to remind ourselves that Chrysotile in Serpentine, the Catseye Actinolite from the Jade Cove area and Tremolite are all forms of Asbestos that we may encounter while cutting some of our favorite chatoyant stones.

While  most of our older and more experienced cutters already know this I thought it was a good place to mention it for our newer members and cutters.

Maybe you want to rethink that dry sanding operation and turn on the water or use dust collection equipment or a respirator .
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« Reply #68 on: August 02, 2012, 08:42:47 pm »

Great comment.  We have mentioned safety several times and even posted irritating to poisonous stones at some point, but you are right that there are always new people coming along that won't know about how dangerous some stone can be.  If i had the time, i would look up the threads, but i don't at this point and am getting brain deader by the second.  So if someone else wouldn't mind............   Thanks.

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« Reply #69 on: August 03, 2012, 06:20:58 am »

I think it might be a good idea to start a sticky thread listing hazardous (and reportedly hazardous) materials and how/why they are toxic...
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« Reply #70 on: August 03, 2012, 07:11:46 am »

   That is an interesting and responsible idea . Soft stone carving is very popular out west , there are many classes and symposiums. Last weekend I went to the 25 th. anniversary week long get-together of a local stone cutting symposium and was appalled at the lack of safety gear , some had no eye protection and plumes of stone were flying through the air. I saw one marble carver using a hammer but about three dozen "carvers" were using industrial grade machinery and no breathing protection.Many of these people were cutting quartz or ultramafic stones  with the risk of silicosis or asbestosis.For many years carvers have been using chainsaws to cut out soapstone blocks to use as carving rough. This soap stone has veins of visible chrysotile asbestos in it. It is normal to see whole families , young kids included , enveloped in the plume. These people are so greedy that when you mention the safety hazard to the children you are rewarded with threats for your trouble. A derivation of this method is to use the chainsaws in soapstone caves. When these people come out of the caves it is a sight to behold. I watched a man who I loved like a grandfather literally die from black lung in front of me , suffocated, a very ,very disturbing sight.I know what risk there is to your lungs from growing up in a mining town and I have found the attitude on this forum refreshing and responsible. Anything we can do to foster this responsible attitude and it's spread to others is to be encouraged.
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« Reply #71 on: September 14, 2012, 08:44:08 am »

AYE AYE to the safety in all aspects of rock working; from digging it out of the ground to the myriad of ways it and your tools can injure you. A little foresight will go a long way.
I just wanted to post a picture of some chatoyant mica with a snakeskin type of pattern I found. Very solid and tight fine grain of about 5 mohs; shines up beautifully. This is taken rough to 3000 diamond
Thanks for looking
Lloyd


* 969121.JPG (62.51 KB, 543x306 - viewed 15 times.)

* 969123.JPG (63.78 KB, 527x340 - viewed 16 times.)
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« Reply #72 on: October 01, 2012, 10:15:58 pm »

Agate creek agate


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« Reply #73 on: October 02, 2012, 03:53:54 am »

Love yellow.

Mark
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« Reply #74 on: October 02, 2012, 08:00:09 pm »

heres some more for you Mark


* aussie 001.JPG (135.45 KB, 783x588 - viewed 14 times.)
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« Reply #75 on: October 02, 2012, 08:01:20 pm »

This one has a bit of chatoyancy in the green section


* aussie 004.JPG (140.37 KB, 783x588 - viewed 18 times.)
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« Reply #76 on: May 04, 2014, 01:51:49 pm »

A lot of science behind such beauties of nature! Really useful facts about gemstones. Thanks for sharing such interesting information.
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« Reply #77 on: May 04, 2014, 06:14:15 pm »

How'd I miss this thread? It does need at least a few cat's eye pics, though, since "chat"="cat" and "oy" comes from "oeil"=eye. Here are a few from my old photos – clouds have rolled in, so no new pics:

chrysoberyl, the original "cat's eye" gemstone


diopside


cat's eye emerald (bad pic, Colombia)


opal (Tanzania)


Glass Buttes cat's eye obsidian (the bright line rolls around even on a flat slab like this)


ulexite (very soft stuff)


oligoclase moonstone
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« Reply #78 on: May 04, 2014, 06:22:44 pm »

Good to see this thread still going on after 5 years and almost 10,000 views.  I probably could add some new pics one of these days when i get time.

Mark
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« Reply #79 on: September 19, 2014, 09:03:03 am »

What about sugulite this slab i have


* CAM02535.jpg (892.32 KB, 2592x1944 - viewed 6 times.)
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« Reply #80 on: September 22, 2014, 10:16:10 pm »

This one has a bit of chatoyancy in the green section

I think you're seeing parallax, not chatoyancy.  There are some similarities in appearance but they're generally accepted as different optical properties.  The direct translation of "chatoyancy" is "like a cat's eye," which requires straight fibers in a stone like chrysoberyl, tourmaline, tiger's-eye and a few others.  http://en.wikipedia.org/wiki/Chatoyancy, tiger's-eye.

The parallax effect is a shadowy optical appearance in tightly-banded fortification agates like yours that moves as the stone is turned.  Both are neat effects and well worth collecting.

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« Reply #81 on: September 22, 2014, 10:21:15 pm »

What about sugulite this slab i have

Sugilite is not a chatoyant stone.  There's no included fibers or crystals in your slab to create the effect.  Sugilite is prized mainly for its color, the occasional presence of related minerals like Richterite and Bustamite, and for its rare translucent (gel) properties. 
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« Reply #82 on: March 23, 2015, 11:11:32 pm »

Now I havent cut any of these but wanted to share cos I love chatoyant gems!! Will see if I can find any more images which fit the brief. I really should organise my photos better! 

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« Reply #83 on: March 24, 2015, 05:32:39 pm »

I don't believe that you have to have an actual cats eye effect to be considered chatoyant.  Here's a repost of my idea of chatoyant, from my very first post that started this thread:

"Chatoyant stones are some of the most interesting and beautiful of the semi precious stones.  The group of chatoyant stones includes such well known stones as Tiger Eye, Marra Mamba, Pietersite, Binghamite, Silk Stone, and varieties of common semiprecious stones like Malachite, Jade, and Obsidian.  Chatoyant stones are those that can change in luster or color by orienting them differently to a light source.  It is also what causes the Tiger Eye property which is a reflected streak of light from a chatoyant stone that is cut and polished into a cabochon."

Of the three qualities listed in a dictionary, the changing of the luster/color by changing the orientation to a light source, is the main quality that i use when determining if a stone is chatoyant.  It is probably the case that most instances of luster/color change, could also lead to a tiger eye effect if properly prepared.  There are other stone characteristics that are often confused as being chatoyant, a few that come to mind are Adularescence and labradorescence.  In the case of Adularescence of Moonstone, you can get a cats eye effect when the milky line forms.  So its a bit confusing out there.  I tend to allow a broader definition and go with any stone that changes luster/color due to a change in the orientation of a light source.  I have stones that are not known to be named, that are chatoyant and there are often instances of non chatoyant stones that will sometimes show some chatoyancy, like in the case of Chatoyant Malachite. 

Please continue to add pics and comments to this thread.  Next milestone, 11,000!!!! posts.

Mark

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« Reply #84 on: March 24, 2015, 07:36:41 pm »

https://www.flickr.com/photos/126911759@N08/16575590411/
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« Reply #85 on: March 24, 2015, 07:42:08 pm »

My new find has this effect as well, mostly borders the green and yellow. Pretty sure it has to do with the high metal.

https://www.flickr.com/photos/50579556@N06/13281016655/
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