#hornblende  a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron
  supertype:  #amphibole  a mineral or mineral variety belonging to the amphibole group
  member of:  #amphibole_group  a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum

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