#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
  supertype:  #oxide  any compound of oxygen with another element or a radical
  substance of:  #cristobalite  #lechartelierite  #quartz  #tridymite
  subtype:  #chert  variety of silica containing microcrystalline quartz
     subtype:  #taconite  a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
  subtype:  #flint  a hard kind of stone; a form of silica more opaque than chalcedony
     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
  subtype:  #silex  a pure form of finely ground silica

No statement uses or specializes #silica; click here to add one.