chert

Noun
  1. Variety of silica containing microcrystalline quartz (synset 114894676)
    is a 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
    subtypes: taconite - a variety of chert containing magnetite and hematite; mined as a low-grade iron ore

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