#feldspar__felspar  any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
  supertype:  spar.mineral  any of various nonmetallic minerals (calcite or feldspar) that are light in color and transparent or translucent and cleavable
  substance:  silicon
  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

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