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IdrissE, October 9 in ROCKS, MINERALS and FOSSILS
It's a black rock.
Cool looking sample! Here are a few guess that might help pin it down. Massive augite, massive hornblende, anthracite coal & pitchblende (uranium ore), just to name a few common black colored minerals. The last one named, to test for uranium, put it next to your goldfish and turn off the lights. If the fish glows its pitchblende; just kidding!
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