Anyone Know What This Is?

[James D. Farrow]

Sorry, the pictures are not very good.

It's kinda metallic, gun metal color, and heavier that other rocks.
Don't have a macro setting on my camera but if I look close up
it is comprised of tiny little facets that glitter.

I weighed a piece of Chestnut Jasper that was about the same size
and it weighed 1 oz. The metallic one weighs 2 oz.

Thanks,

James

[stonemon]

My guess is marcasite. Also known as white iron pyrite.
Pics are challenging.
This is a epithermal mineral common in narrow vein deposits.
Could be wrong...
Bill

[James D. Farrow]

Thanks!

Looked up Marcasite in a couple of books (Smithsonian) that I have and the description
fits good. Color not really but they do say it darkens with exposure so you are probably
right.

Thanks again,

James

[Frantic Tumbler]

Most likely pyrite, not marcasite. A granular crystalline mass.