#pyrophoric_alloy  an alloy that emits sparks when struck or scratched with steel; used in lighter flints
  supertype:  #alloy__metal  a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
  subtype:  #ferrocerium  a pyrophoric alloy of iron with cerium; used for lighter flints
  subtype:  #misch_metal  a pyrophoric alloy made from a mixture of rare-earth metals

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