quartz glass

Noun
  1. Colorless glass made of almost pure silica (synset 114903901)
    is a type of: natural glass - magma of any composition that cooled very rapidly
    substance holonym: 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
    same as: crystal, lechatelierite, quartz, vitreous silica

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