quartz crystal

Noun
  1. A thin plate or small rod of quartz cut along certain lines and ground so that it can produce an electric signal at a constant frequency;
    Used in crystal oscillators (synset 104039186)
    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

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