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 Post subject: Magenta/Violet and Emerald Green Vesuvianite
PostPosted: Thu Jan 18, 2007 12:20 pm 
Does anyone have any definitive measurements of the refractive indices of the emerald green and magenta-violet-y vesuvianites from the Jeffrey Mine, Asbestos, Quebec? I'd like to know whether their RI's are diffrerent from other, "common" vesuvianites.


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PostPosted: Wed Jul 25, 2007 7:59 am 
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Joined: Mon Oct 17, 2005 2:52 pm
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Location: France | French Riviera
Hello Daniel,

I will try to take RI on a crystal face of my sample of chromian vesuvianite from Jeffrey mine.
The spectrum of this sample looks like this image.
Image

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Jean-Marie Arlabosse
GemInterest.com


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PostPosted: Fri Apr 18, 2008 3:18 am 
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Location: France | French Riviera
Hello, Daniel,
Sorry for the delay :oops:

Despite some little difficulties to read the RI on a crystal natural facet, I have take the refractive index on my sample of Jeffrey mine, deep green, Cr-beharing vesuvianite.

Arround 1.720 with a birefringence probably near of 0.001.

I have check a "normal" greenish vesuvianite and I have the same RI reading (i.e. 1.719-1.720 DN~0.001)

It seems that Cr-Vesuvianite has not very different RI than a "normal" vesuvianite".
Hope that help.

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Jean-Marie Arlabosse
GemInterest.com


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