chert

Definitions of chert
  1. noun
    variety of silica containing microcrystalline quartz
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    types:
    taconite
    a variety of chert containing magnetite and hematite; mined as a low-grade iron ore
    type of:
    silica, silicon dioxide, silicon oxide
    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
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