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Identity HelpAnthracite?

23rd May 2012 01:09 UTCHervé Osana

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

23rd May 2012 22:12 UTCRock Currier Expert

I have not a clue.

24th May 2012 06:01 UTCSergey Sayamov

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?

24th May 2012 16:01 UTCRonald John Gyllenhammer Expert

Hematite?

24th May 2012 17:23 UTCErik Vercammen Expert

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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