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OpenStudy (gokuporter):
Why is coal not classified as a mineral? it is does not occur naturally it is not a solid it is made of organic material it has no crystal shape
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OpenStudy (anonymous):
i know it's not a or b
OpenStudy (gokuporter):
c?
OpenStudy (anonymous):
Coal doesn't have a defined chemical composition so I would say either it has no crystal shape or it doesn't occur naturally.
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