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White octahedral crystals from Francon quarry ?

António Manuel Ináçio Martins July 07, 2012 11:43AM
Olá friends !!!!
I've been to see the magazine article of Mineralogical Record 37/1 about Francon quarry minerals and could not identify the white crystals with a octahedral configuration. Someone expert on the mineralogy of this site can help me identify this mineral.

Thanks.... Martins da Pedra
Phil M. Belley July 07, 2012 02:20PM
A pseudo-octahedral cryolite perhaps? I am no expert on Francon though.
Modris Baum July 07, 2012 02:58PM
I agree that cryolite is a possibility. But I don't have much experience with Francon either.
António Manuel Ináçio Martins July 07, 2012 04:41PM
Hi smiling smiley
Maybe a pseudomorphose of Cryolite in Gibbsite ?


Martins da Pedra
Reiner Mielke July 07, 2012 04:45PM
Unusual form of fluorite maybe?
Modris Baum July 07, 2012 05:12PM
I should probably add that the one sample of cryolite that I have from Francon does not look very much like this. But that's just one (micro) sample.

Edited 1 time(s). Last edit at 07/07/2012 06:57PM by Modris Baum.
Bill Lechner July 07, 2012 06:33PM
More than likely Fluorite
António Manuel Ináçio Martins July 08, 2012 11:08AM
The cryolite is pale yellow, and with well defined edges. These white crystals are rounded, but realizes the octahedral configuration. Yes it can be Fluorite but the Fluorite of this place is lilac....well is strange and is not mentioned or photographed in the magazine article.

Martins da Pedra
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