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aragonite vs. calcite

[ uh-rag-uh-nahyt, ar-uh-guh- ]
  1. a mineral, orthorhombic calcium carbonate, CaCO3, chemically identical with calcite but differing in crystallization and in having a higher specific gravity and less marked cleavage.
[ kal-sahyt ]
  1. one of the commonest minerals, calcium carbonate, CaCO3, found in a great variety of crystalline forms: a major constituent of limestone, marble, and chalk; calc-spar.

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