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silica

Definitions of silica
  1. noun
    a white or colorless vitreous insoluble solid (SiO2); various forms occur widely in the earth's crust as quartz or cristobalite or tridymite or lechatelierite
    synonyms: silicon dioxide, silicon oxide
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    types:
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    chert
    variety of silica containing microcrystalline quartz
    flint
    a hard kind of stone; a form of silica more opaque than chalcedony
    silex
    a pure form of finely ground silica
    gunflint
    the piece of flint that provides the igniting spark in a flintlock weapon
    taconite
    a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
    firestone
    a piece of flint that is struck to light a fire
    flintstone
    pebbles of flint used in masonry construction
    type of:
    oxide
    any compound of oxygen with another element or a radical
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