calcite

Definitions of calcite
  1. noun
    a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
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    types:
    Mexican onyx, alabaster, onyx marble, oriental alabaster
    a hard compact kind of calcite
    chalk
    a soft whitish calcite
    Iceland spar
    a transparent calcite found in Iceland and used in polarizing microscopes
    type of:
    spar
    any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable
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