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OpenStudy (anonymous):
Which is characteristic of a mineral? A. It must be crystalline and have an indefinite chemical composition. B. It must be amorphous and have an indefinite chemical composition. C. It must be amorphous and have a definite chemical composition. D. It must be crystalline and have a definite chemical composition.
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OpenStudy (anonymous):
It must be crystalline and have a definite chemical composition :D
OpenStudy (anonymous):
Yep, D. A rock is a conglomerate of multiple minerals. Minerals must have a definite chemical formula that can describe the entire sample. Rocks require multiple different chemical formulas to describe the different minerals in it.
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