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PostPosted: Tue Jan 29, 2008 9:28 pm 
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:smt033
JB wrote:
Does this help?
Absolutely. I needed to know it exists synthetically. Thanks!

There is no twinning or growth lines visible in this sample, inspected with benzyl bezoate between crossed polars.

The only inclusions I have been able to find, looking down the long axis of the gem are a sprinkling of what could be termed "breadcrumbs". I will try to get a photo later.

I'm off now for the Ron Ringsrud seminar. Anyone in the bay area? Still time to make it!


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PostPosted: Sat Feb 02, 2008 12:03 am 
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It's synthetic isn't it? It's okay, I've braced myself. :shock:


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PostPosted: Sun Feb 03, 2008 3:36 pm 
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Indeed, it is synthetic.
Image
Here is a photo of the "breadcrumb" like inclusions that are visible throughout the stone (60x magnification).
They are typical of hydrothermally produced synthetic quartz.


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PostPosted: Mon Feb 04, 2008 11:33 am 
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Thanks Barbra for an Outstanding work! Now I can finally sleep at nights... :smt033

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PostPosted: Wed Feb 06, 2008 7:19 pm 
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Thank you very much Barbra! The gems are beautiful and certainly priced right but as Barbra has determined, there are not natural.

I have contacted the seller and still no response.
This is an auction from them if anyone is interested.


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PostPosted: Thu Feb 07, 2008 2:27 pm 
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Just another of those sellers with Be-treated sapphires, dark purple spinels, hydrothermal quartz, and so on...

Nice to have this case finished properly:)

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PostPosted: Sun Mar 16, 2008 7:33 am 
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that bi-color stuff (kinda ugly in my opinion) is called "Cristinite" and is indeed man-made. Comes from Australia


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PostPosted: Sun Mar 16, 2008 8:41 am 
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Thanks Aymeric!
Just wish those russian labs would have such sites where the properties, methods and inclusions are disclosed... Guess it's too much to hope for :roll:

-Johannes

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PostPosted: Sun Mar 16, 2008 11:19 am 
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The bi-colored synthetic quartz I tested was not Cristinite. Cristinite is NOT quartz.


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PostPosted: Sun Mar 16, 2008 12:17 pm 
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Exasperation level RED.
You actually need to read the thread gang. You can't just look at the pictures. :idea:


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PostPosted: Sun Mar 16, 2008 4:09 pm 
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LOL ! I indeed missed your posting of the link JB, don't whip me pleaaaase!


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PostPosted: Sun Mar 16, 2008 4:24 pm 
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No, Gemswallah, you didn't bother to read that the bicolored stone was positively identified as quartz. It has nothing to do with Cristinite (whatever that is). :lol:


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PostPosted: Sun Mar 16, 2008 5:45 pm 
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... ok ok, deepest excuses a simple debutant who has only small knowledge and has replied a bit too quickly on that one...

Still, given that Cristinite is chalcedonic material and chalcedoine is a variety of quartz, does it makes my supposition so stupid ?

Cheers


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PostPosted: Sun Mar 16, 2008 6:46 pm 
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I reacted in about the same way on the word "chalcedonic", anyone heard that word before and know what they mean?

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PostPosted: Sun Mar 16, 2008 7:34 pm 
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Quote:
Cristinite is chalcedonic material

Based on what?
What is the definition of a chalcedonic material? New one to me. :?

Chalcedony is a microcrystalline aggregate
Chalcedony has a refractive index of 1.54-1.560

Neither of those attributes describee cristinite.


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