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Physics 20 Online
OpenStudy (anonymous):

Although coal is sometimes considered a mineral, which criteria of minerals does it violate? A. Minerals are solids. B. Minerals are natural. C. Minerals are inorganic. D. Minerals have a definite chemical composition.

OpenStudy (anonymous):

C, since coal is made up of organic residues after some processes, but, in contrast, minerals are not.

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