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  • 2 weeks later...

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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