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A rock differs from a mineral in being

  • A.always harder than any single mineral
  • B.an aggregate of one or more minerals
  • C.a single mineral of large crystal size
  • D.a mineral with no definite composition

Answer: B

Correct answer: an aggregate of one or more minerals

A mineral is a naturally occurring solid of definite composition and ordered internal structure; a rock is an assemblage of mineral grains held together. Most rocks contain several minerals, though some - a pure limestone, a quartzite - contain essentially one, which is why the definition says one or more.

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