#olivine  a mineral consisting of magnesium iron silicate; a source of magnesium
  supertype:  #mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  substance:  #magnesium
  subtype:  #chrysolite  a brown or yellow-green olivine found in igneous and metamorphic rocks and used as a gemstone
     subtype:  #peridot  a pale green variety of chrysolite; used as a gemstone

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