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From Tanzania - very heavy and black - what are these?

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asked Nov 5, 2018 by Chakyi (120 points)

2 Answers

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If it is a metallic ore, you could help with identification by answering these questions: Are they magnetic? If so, how strongly attracted is it to the magnet? Does it stain your hands? If so, it might actually be graphite. And, can you post a better picture with a size reference, such as a penny? We can go from there!
answered Nov 6, 2018 by linkisnotzelda (5,360 points)
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Iron ores will be strongly magnetic. The brown may be oxidation. That would rub off(not completely) but it would stain your fingers with the dust. As for the reference piece, a coin or ruler in any picture will give perspective. Are these rocks heavier than similar sized rocks? That would also be a strong indicator of metallic ore.
answered Nov 7, 2018 by Weasel (58,160 points)

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