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PostPosted: Sun Jul 06, 2008 2:45 pm 
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Hi,

Amblygonite -- comes in white, pink, green, blue and golden yellow. R.I. = 1.6, Hardness = 6

Right?

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PostPosted: Sun Jul 06, 2008 2:50 pm 
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Ya, not enough data. But it wouldn't be a quiz anymore fun if we had the numbers... would it.

The other clues are more interesting: that there are no usual treatments, that the species is not terribly exotic with brownish-yellowish green and grayish blue fairly well publicized colors, and pink a serious rarity that is barely mentioned anywhere in literature.

Now, probably... my guess is wrong nonetheless :?


On the side a bit:
Is there such a thing as blue Forsterite? That was the other option... because of the muddy green there; I know of some pink and orange as extreme oddities, but no blue.


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PostPosted: Sun Jul 06, 2008 2:53 pm 
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Facetor wrote:
Hi,

Amblygonite -- comes in white, pink, green, blue and golden yellow. R.I. = 1.6, Hardness = 6



Are there any examples of faceted Amblygonite that isn't pastel yellow to green or colorless?


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PostPosted: Sun Jul 06, 2008 3:17 pm 
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Wow, lot's of action since I last checked! And I couldn't agree more, too much info to start would really have been boring!

Okay, we had a Feldspar guess, but that doesn't fit with the RI. And Scapolite, but the green would be seriously unusual.

And we have actually had the correct answer. Bob, your reasoning with Amblygonite is good, I have actually seen some that verge on the saturation of the pink stone. However, it was your first guess that was the right one - this is Vesuvianite.

The first is a manganese rich variety (usually just called mangano-Vesuvianite) from the Jeffrey Mine in Quebec. Some crystals are photographed on Webmineral. The second is the copper rich blue variety from Sri Lanka that is usually still called Cyprine - a subtle clue being the size as these are almost always very small. And finally the typical color range, a stone from Tanzania.

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PostPosted: Mon Jul 07, 2008 12:05 pm 
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valeria102 wrote:
On the side a bit:
Is there such a thing as blue Forsterite? That was the other option... because of the muddy green there; I know of some pink and orange as extreme oddities, but no blue.


Synthetic Forsterite is a (theoretical at least) Tanzanite simulant. That argues that you can make blue Forsterite. No idea if it is found naturally.


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