#calcite  a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
  supertype:  spar.mineral  any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable
  substance:  calcium_carbonate
  substance of:  limestone
  subtype:  oriental_alabaster__alabaster__onyx_marble__Mexican_onyx  a hard compact kind of calcite
  subtype:  chalk.calcite  a soft whitish calcite
  subtype:  Iceland_spar  a transparent calcite found in Iceland and used in polarizing microscopes

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