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Showing results for tags 'dark'.
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Hi, always from the Omhden (DE) quarry. I'm wondering what this dark mineral actually could be... I'll report 2 different speciments, both about 10-15cm in length. They have little white "spiderweb" across the dark lucid surface. it is like 1mm thick this could be really useful for beginners like me thanks a lot Paolo
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Hi, My name is Neal, I found this rock on the side of a railroad bed near Caro, MI. It is heavy for it's size, and has quite a bit of porosity to it. Any help would be appreciated. Thanks!!