#plagioclase  any of a rock-forming series of triclinic feldspars
  supertype:  feldspar__felspar  any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
  substance of:  basalt
  subtype:  albite__white_feldspar__whitefeldspar  a widely distributed rock-forming feldspar
  subtype:  anorthite  rare plagioclastic feldspar occurring in many igneous rocks

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