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Frequently Used Lapidary Terms

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bobby1
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« on: January 13, 2012, 06:54:22 pm »

Moss Agate - Sometimes called Mocha Stone - has wispy three dimensional filaments that look like green moss floating in a pond. Sometimes the patterns are brown, red or orange. Though it looks like real moss it isn't organic in origin. Red Moss has Iron as its coloring agent and black moss is colored by Manganese
Photo 1
Green Moss from India

Photo 2
Priday Thunderegg Moss from Oregon

Sagenite  - Also called Sagenitic Agate - has 3 dimensional needle like or acicular mineral growths. The inclusions are often shaped like fans or sunbursts and can be black, red, or yellow.
Photo 3

Plume Agate - has fluffy or feather like inclusions that are three dimensional and can be of  varied colors. The inclusions can also resemble flowers or plants.
Photo 4 Graveyard Point Plume Agate

Photo 5 Graveyard Point Plume Agate

Photo 6 Marfa Plume Agate from Texas

Dendritic Agate - has two dimensional,  thin, tree like growths that are most often black or dark brown. They are often colored black by Manganese and can occur on the surface of many different materials such as sandstone, talc, and limestones.  They can also form in bands within an agate and this form is common with Montana Agate.
Photo 7 Montana Dendritic Agate

Photo 8 Montana Dendritic Agate in the shape of a flower

Druzy - also spelled Druse or Drusy - has a blanket of tiny sparkling Quartz crystals on a flat or curved surface.  It is often found lining the inner surfaces of a geode. Other crystals such as Garnet,  can form Druzy surfaces.
Brightly colored Druzy surfaces are mostly various minerals vacuum diffusion coated with titanium, gold
or silver. 
Photo 9 Druzy from a Brazilian Agate  geode

Photo 10 Druzy from a very large Brazilian Agate geode
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Steve
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« Reply #1 on: January 13, 2012, 07:14:06 pm »

Very good.............Thank you...............I'm still learning about the names of different stones and all the help helps........ yes
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Steve.............The Silver Fox

My Photo Bucket site:  http://s743.photobucket.com/user/sferenz/library/?sort=3&page=1

ScarlettoSara
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« Reply #2 on: January 14, 2012, 08:39:34 am »

It was a great treat to see your babies Bobby and also to learn more:)
Thank you:)
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"I tramp a perpetual journey.
― Walt Whitman, Song of Myself
Rockoteer
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« Reply #3 on: January 14, 2012, 10:00:22 am »


Well done......Very nice pics.....Maybe a new camera would help me.....or lighting perhaps....

You do take some nice pics.

TOG
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-Gary

Of all the things I've lost..I miss my mind the most.

Whether you think you can, or you think you can't, you're probably right.
39don
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« Reply #4 on: January 14, 2012, 06:38:51 pm »

Thanks Bob for the info. Very nicely done.......
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Charlotte
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« Reply #5 on: January 14, 2012, 10:10:07 pm »

Bob, your cabs are simply elegant.  Thank you!
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« Reply #6 on: February 11, 2012, 06:28:30 am »

Brilliant workmanship ... iparticularly impressed by the Montana Dendritic Agate in the shape of a flower
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3rdRockFromTheFun
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« Reply #7 on: February 11, 2012, 06:43:16 am »

Bob, those are amazing! My favorite is the Montana flower - looks like a palm tree scene. Totally killer!  yes
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-frank-

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« Reply #8 on: November 15, 2012, 08:14:58 pm »

just ran across this and I must express my thanks for taking the time to make life easier for many of us who have been muddling through  the differences for awhile now!!!

(although I still like to muddle from time to time!!)
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Mario

Just when everyone thought I was finally gonna clean up my act, I found a new way to get muddy.

I once sought the meaning of life, but I got side tracked by an agate!
mirkaba
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« Reply #9 on: November 16, 2012, 08:48:10 am »

Great post Bobby1! Very nice cabs. Especially like the Montana Agate. The Montana Agate is generally called 'Montana Moss Agate' even though a small proportion actually shows moss like inclusions.
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Bob

Gathering dust in Montana.
spiffman
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« Reply #10 on: March 05, 2013, 08:30:48 am »

Bobby, I'm new to lapidary for the second time in my life. One day I hope to be able to produce such wonders as you have here. My question is about the pictures tho. May I ask what lens you're using?
Thanks Tim
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bobby1
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« Reply #11 on: March 05, 2013, 11:09:49 pm »

I'm using the standard 18 - 55mm lens that the camera came with. I use two photoflood lamps to light the cabs, a small plastic gizmo to hold the cabs above the photo graidient background, highest resolution, hand held about 12" to 14" away, let the camera focus automatically and let it select the exposure.  I then download it with Windows photo programs and to get it up real close I crop the photo fairly close to the cab. I don't have nor use a macro lens.
Bob
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Rockoteer
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« Reply #12 on: March 09, 2013, 06:14:47 pm »


I most definately(sp) need a new camera... yippie

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-Gary

Of all the things I've lost..I miss my mind the most.

Whether you think you can, or you think you can't, you're probably right.
SEW1950
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« Reply #13 on: March 23, 2013, 08:13:50 pm »

Thanks much for taking the time with the basics, as a newbie on my first day I have already, and painlessly, learned some more. If I could very mousily, humbly, earnestly, (alright, whiningly) ask that you include pronunciations with some of the terms? Still remember the time in a rock shop when I pronounced chalcedony like 'chalice' and 'stoney'. Almost got laughed out all the way to the sidewalk. Required therapy.
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spiffman
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« Reply #14 on: March 29, 2013, 04:00:40 pm »

Hey Bobby, I read your reply the day after you answered my question and as I was going through here again to help myself remember the lessons here i saw I never thanked you for your answer.  I would add that I have pretty much the same set up as you do only I don't have the wonderful gems you captured.  After years of landscape and portraits... man, taking pictures of rocks is making me stoned  dancer5 , no really i'm struggling with these &%$* things...  but love every minute of it....
Tim  
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