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What is it?
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=19&t=3862
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Author:  Brad P [ Wed Sep 26, 2007 12:08 pm ]
Post subject:  What is it?

As a follow-up to the Villiaumite I posted under the "photos" topic, here is another obscure gem material that might make an interesting quiz.

Image

Now, what can I say about this one. Well, like Villiaumite it is not usually seen as a cut stone. It's RI and SG are both relatively low but it is a natural material and hasn't been treated. It's African in origin.

That's pretty vague but might be good for a few guesses, I'll add more info later.

Brad

Author:  Doos [ Wed Sep 26, 2007 1:31 pm ]
Post subject: 

Hi,

Colourless African emerald, pretty rare material outside the ebay world.

Author:  Brad P [ Wed Sep 26, 2007 1:47 pm ]
Post subject: 

I wish! :wink:

Author:  Ben P [ Wed Sep 26, 2007 2:43 pm ]
Post subject: 

Some wild guesses:

Pollucite (probably not)
Jeremejevite (does it come in colorless)
Thaumasite (colorless, from Africa, maybe?)
Hambergite (colorless)

Author:  jett [ Wed Sep 26, 2007 3:30 pm ]
Post subject: 

GAYLUSSITE: Just to keep up my Village idiot status

Author:  Barbra Voltaire, FGG [ Wed Sep 26, 2007 6:05 pm ]
Post subject: 

In all fairness, I think we need some clues:
Singly or doubly refractive?
Associated minerals.
Igneous? Metamorphic? Sedimentary?

Author:  jett [ Wed Sep 26, 2007 7:43 pm ]
Post subject: 

Brad? Where are you?
Okay I have to start dinner now. If I win I want a color change garnet. :P

Author:  Ben P [ Wed Sep 26, 2007 8:44 pm ]
Post subject: 

Do tell what that beautiful green stone is in your avatar is? I saw you posted it today and it looked very nice next to my red stone in my avatar.

Author:  Gem├ža [ Thu Sep 27, 2007 7:21 am ]
Post subject: 

Ben P wrote:
Some wild guesses:

Pollucite (probably not)
Jeremejevite (does it come in colorless)
Thaumasite (colorless, from Africa, maybe?)
Hambergite (colorless)


Yes, jeremejevite can be colorless (some sample of Madagacar).
I think like Ben P for jeremejevite. ;-)

Author:  Brad P [ Thu Sep 27, 2007 10:12 am ]
Post subject: 

Barbra, of course more info was to follow, the intro was just a bit of a teaser. Curious as to what the initial guesses would be - and low and behold it was our self-proclaimed "village idiot" which called it.

This is faceted Gaylussite, an evoraporite (so sedimentary I guess) from the seasonal Lake Amboseli in Kenya.

RI: 1.444, 1.515
SG: 1.96
Moh's hardness: 2.5
Water Soluble

I'll have to make it tougher next time. Already have a few in mind :twisted:

Ben - you're right, I just started playing with the avatars yesterday. This is a Chrome Diopside that I had on the site a couple of months ago. Some pictures I just always like.

Oh and jett, I think you should get a color change garnet as well - now to find someone to give you one :wink:

Brad

Author:  jett [ Thu Sep 27, 2007 11:08 am ]
Post subject: 

:shock: Who me?
Wow, that is a shock! I didn't even use my forum coach,(africanuck). I flew solo.

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