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Anthracite?

Posted by HervĂ© Osana  
Anthracite?
May 23, 2012 12:09AM
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
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avatar Re: Anthracite?
May 23, 2012 09:12PM
I have not a clue.

Rock Currier
Crystals not pistols.
Re: Anthracite?
May 24, 2012 05:01AM
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?
avatar Re: Anthracite?
May 24, 2012 03:01PM
    
Hematite?
Re: Anthracite?
May 24, 2012 04:23PM
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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