Vegtable or Mineral?

[605dano]

Do you think the green material in the stone is from plant stains or a mineral? I can't really tell

 

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[Eu_citzen]

I'd say mineral.

 

[605dano]

What kind of mineral do you think it could be? It came from a quartz vein in mica shist. Epidote? Diopside?

 

[wvplug]

Kryptonite? Where is Superman when you need him? Looks like an algae that has been crystallized/fossilized to me.... Where was this recovered?

 

[605dano]

On the surface of a quartz stringer. You may be right. I never thought of Kryptonite.

 

[wvplug]

No I mean where in the world did you find this??

 

[605dano]

I live in South Dakota. I found this in the Black Hills.

 

[Eu_citzen]

Can't say, can you scratch it with a knife?