rock crystal

Noun
  1. A clear quartz used in making electronic and optical equipment (synset 114718454)
    is a type of: quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
    subtypes: rhinestone - an imitation diamond made from rock crystal or glass or paste
    same as: transparent quartz

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