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A mineral is a naturally occurring solid with a definite chemical composition and a

  • A.definite crystal structure
  • B.definite colour in every specimen
  • C.definite hardness on every face
  • D.definite origin in igneous rock

Answer: A

Composition and structure together define the species, which is why the same substance formed artificially is not strictly a mineral. Colour varies with trace impurities and is one of the least reliable identifying properties.

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