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What black glassy mineral might you get if molten lava cooled so rapidly that crystals did not have time to form
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4 votes
What black glassy mineral might you get if molten lava cooled so rapidly that crystals did not have time to form

User Mykola Yashchenko
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2 Answers

4 votes
I think it is physician because I read it in a book
User SJHowe
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0 votes
It might be obsidian.
User Simon Peyou
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