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Posted by Hervé Osana  
Hervé Osana May 23, 2012 01:09AM
I would like you'r suggesting about this sample
I 'd found this one under icemount "Les Bossons" near at Chamonix town
It mean carbon but there is a crystal included. we can observ in clos-up a mix of colored micro-crystals
Perhaps whith picture quality, it's visual effect. I can't do perfectly more
Thank you
open | download - sun effect.JPG (93.3 KB)
open | download - sun effect 3.JPG (123.3 KB)
open | download - bismuth.JPG (105.5 KB)
Rock Currier May 23, 2012 10:12PM
I have not a clue.

Rock Currier
Crystals not pistols.
Sergey Sayamov May 24, 2012 06:01AM
Crystal looks like a weathered sulfide with tarnish...Tarnish makes the effect of many colorful dots - it doesn't look like there're mix of microcrystals. Due to the base colour - pyrite maybe?
Ronald John Gyllenhammer May 24, 2012 04:01PM
Erik Vercammen May 24, 2012 05:23PM
Pyrite is very common in coal layers. It may cause self-ignition of the coal when it oxidizes and gives heat, and a lot of secondary sulfates are found in coalmines.
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