#spar.mineral  any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable
  supertype:  #mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  subtype:  #feldspar__felspar  any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
     subtype:  #orthoclase  a white or colored monoclinic feldspar
     subtype:  #plagioclase  any of a rock-forming series of triclinic feldspars
        subtype:  #albite__white_feldspar__whitefeldspar  a widely distributed rock-forming feldspar
        subtype:  #anorthite  rare plagioclastic feldspar occurring in many igneous rocks
     subtype:  #moonstone  a transparent or translucent gemstone with a pearly luster; some specimens are orthoclase feldspar and others are plagioclase feldspar
  subtype:  #calcite  a common mineral consisting of crystallized calcium carbonate; a major constituent 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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