Lapidary / Gemstone Community Forum
April 11, 2021, 01:22:23 pm
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
 
  Home Help Search Login Register  
  Show Posts
Pages: [1] 2 3 4
1  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Need ID help...and a question on: January 13, 2016, 03:37:38 pm
I bought this piece of rough that was labeled Azurite and Malachite.  Is that a correct ID?  I don't know anything about the origin of the rough other than "Mexico" is written on it.

It looks a lot like some other rough that I bought that is Chrysocolla.  I'm assuming that the red coloring in the rough is Cuprite.  Could this be a combination of all of them (Azurite, Malachite, Chrysocolla, and Cuprite).  If it is...would that be what is called Sonora Sunrise (Cuprite Chrysocolla)?...and if so...at what amount of Cuprite content does regular Chrysocolla become Sonora Sunrise?

Thanks for the help!
2  The Gathering / Introductions / Re: Newbie on: December 16, 2015, 11:20:20 pm
 welcome2 to the forum!

There's lots to be learned here.

It is VERY difficult to move from hobbyist to the point of working stone as a "source of income". 

Yes, and that is a topic that I will be approaching on this forum at some point in time...not really appropriate for the introduction area though.
3  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Re: Cutting Perfect Circles on: December 16, 2015, 10:49:34 pm
Most commercial cabs including circles are cut on a semi automatic machine that rotates the dopped cab into  a grinding wheel incrementally until it matches the model attached to the machine. Some folks put the dopped cab in a nattery powered drill gun and while handholding it run the edge slowly into the wheel. After the girdle is done you can slowly rotate the stone towards the top and crown it as well. Incresing the speed as the girdle preform becomes quite round will help make it better if you hold the drill carefully. Minute hardness differences in the stone lead to the small asynetries you are referring to in many cases but the way our hands rotate can also make a perfect circle very difficult when hand cutting. Obviously no stone circle is perfect but I hope you get some to the point they do not bother you. I have a very similar problem  when looking at certain shapes.

I have tried the drill technique with fair success.  I do think that the minute hardness differences is what is causing most of what I'm describing. I'm thinking of attempting to build a mount to hold the drill at 90 degrees that will allow me to slowly move it into the grinding wheel, and then by releasing the lock allowing it to swivel to crown it.

I wrote an article that was in last November's issue of Rock and Gem in my monthly column that addresses this specific situation. I use a circle template as most people do but when I draw the circle from the template I use a black ball point pen so the line is narrow and well defined. When I'm grinding to this line I go slowly and grind up to this line but never beyond it. I always ensure that I'm grinding at a 90 degree angle to this girdle. If you grind past the line you don't have a reference to know how far beyond you have gone. I use the same pen lying on its side to draw a line halfway between the top and the bottom of the preform. As I grind the first pass I'm always looking at that line and again I never grind below it. As I make the first grind depth into the dome I ensure I have ground it the same all around. I continue grinding around the preform keeping it even all the way around. I do this to keep the symmetry balanced. Sanding and polishing after the grinding activity proceeds as usual.
Bob

I've been using an extra fine point sharpie for line work.  The last piece I was working I stopped with a consistent millimeter or so left before I got to my line.  I intended on sanding with 400 to work the last bit to the line, and everything looked good until I placed it to the mount to check the size.  There were two spots that were (at least to me) a little off. My lines were still just visible, but it was just enough to be noticeable in the mount...as stated above...I think the subtle differences in the stone got it a little off.  It's not much, but I'm always looking for ways to make it better.
4  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Cutting Perfect Circles on: December 16, 2015, 08:16:13 pm
I did some searching on here to see if this topic had been previously discussed, but I didn't find what I was looking for.

I was working at cutting a round cab for a mount that I had, and noticed that although I was pretty close to having the cab perfectly circular,  there were a couple of spots that were just a tiny bit off.  It wasn't noticeable when looking at the cab until I held it to the mount.  It would probably be fine and most people wouldn't even notice it...but I do.

Does anyone have any tricks/techniques that help to achieve perfectly rounded cabs?
5  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Re: So.... I've been gone for awhile. on: December 15, 2015, 09:19:17 pm
I never get bored looking at stones.  As far as I'm concerned, post them all!

I love the Charoite and Crazy Lace.
6  Custom Designed Jewelry / Show Your Custom Jewelry Designing Photos / Re: First setting in my new studio on: December 15, 2015, 09:15:48 pm
Wow!  Fantastic silver work, and a beautiful cab! 
7  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Mineral Specimens / Re: ID help on: December 14, 2015, 02:55:00 pm
The first one is a slab of crinoids in matrix.

The fourth one looks like some jasper and hematite that I've got several pieces of, but hard to tell from a picture.
8  The Gathering / Our Place / Re: 4 inch grinder with diamond blade on: December 11, 2015, 06:25:24 pm
If you're cutting stone dry, be sure to always wear a respirator or at least a dust mask.  The dust can be rather toxic for certain stones, and silicosis is a danger as well.
9  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Another great day of rocks on: December 11, 2015, 05:53:48 pm
Yep. Looks like a pretty great day, alright. Love that Chrysocolla.

Question about your Llanite. Did the rough have small internal fractures? Not like long cracks running all the way through it, but random little short hairlines?

Nice variety of rocks you've got going there. Keep 'em coming... .

Yes, there are some.  You can barely see them.  Like you said, they don't run all the way through.  Most are maybe a couple millimeters or so.  I have another large piece of rough that I've haven't cut or looked at too closely.  I'll look at it and see if it was the same internal fractures as well.
10  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Another great day of rocks on: December 11, 2015, 03:56:14 pm
...more new material:

5.  Honduras Opal...Doesn't have a lot of opal showing, but something new to play with.
6.  Unknown...Anyone have any ideas?   


So yes, it's been a great day of rocks. 
11  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Another great day of rocks on: December 11, 2015, 03:54:08 pm
...and as if that wasn't enough of rocks for the day, I got to stop at my local rock shop and pick up some new material to work with.

1.  Rhyolite
2.  Snowflake Obsidian
3.  Rhodochrosite
4.  Aquamarine and Beryl
12  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Re: Another great day of rocks on: December 11, 2015, 03:49:54 pm
So, after that, I was inspired to go outside and do a little work.  I didn't have a whole lot of time today, but I did some rough shaping on a few stones.  Still need the finish work, but they're started.

1.  Chrysocolla
2.  Sodalite
3.  Llanite
4.  Tiger Iron 

13  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Rough on the bench and slabs off the saw (general minerals board) / Another great day of rocks on: December 11, 2015, 03:45:25 pm
Yes, it's been a good day to play with rocks!

  yes

I started thinking about how long I've been picking rocks up off of the ground, and what all led me to start doing more than just sitting them on a shelf.  I looked through some old rocks today and found the two rocks that probably mean more to me than any other rocks I have.  They may not be the shiniest, coolest, or most valuable ones I have, but it's their history that is important to me.

Anyone else have rocks like that?

Here are the two rocks:

The first:  I simple colonial coral fossil that I found when I was a kid.  I've packed this rock around for decades.  It was the first rock that I picked up and kept.  It's been with me all these years.  It's crazy to think I still have it.

The second:  A simply unassuming piece of honey calcite.  Why is it important?  It was the first time I picked up a rock, and thought "I wonder what this would look like if it was polished?"  It was the rock that led me into lapidary arts. 

These two rocks are special to me, not for their monetary value, but for where they have led me.

And that was just the start of the day...I'll add more in the following post.
14  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Share Our Finished Cabochons and General Cabbing Questions / Tutorials / Re: Couple afternoon cabs on: December 10, 2015, 10:52:27 pm
Do you know what the material is on the second cab?  I really like the colors in it.
15  The Gathering / Introductions / Re: Hello from the middle of Illinois on: December 09, 2015, 08:21:11 pm
 welcome2 to the forum!

There's lots to be learned here (I'm still learning myself).

Nice job on your first cab!
Pages: [1] 2 3 4
Bookmark this site! | Upgrade This Forum
SMF For Free - Create your own Forum

Powered by SMF | SMF © 2016, Simple Machines
Privacy Policy