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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.
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OpenStudy (goformit100):
B. Minerals are natural.
OpenStudy (anonymous):
Coal is natural.
OpenStudy (anonymous):
But coal contains carbon, so what does that imply?
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