#flint  a hard kind of stone; a form of silica more opaque than chalcedony
  supertype:  #silica__silicon_oxide__siliconoxide__silicon_dioxide__silicondioxide  a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechartelierite
  subtype:  #gunflint  the piece of flint that provides the igniting spark in a flintlock weapon
  subtype:  #firestone.flint  a piece of flint that is struck to light a fire
  subtype:  #flintstone  pebbles of flint used in masonry construction

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