#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
  supertype:  #mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  member:  #amphibole  a mineral or mineral variety belonging to the amphibole group
  member:  #nephrite  an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form; a source of jade that is less valuable than from jadeite; once believed to cure kidney disorders
  member:  #actinolite  a green mineral of the amphibole group; calcium magnesium iron silicate
  member:  #anthophyllite  a dark brown mineral of the amphibole group; magnesium iron silicate
  member:  #asbestos  a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer
  member:  #tremolite  a white or pale green mineral (calcium magnesium silicate) of the amphibole group used as a form of asbestos
  member:  #hornblende  a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron

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