Rock crystal

noun

Definitions

Noun
  1. 1
    A clear, colorless form of the silica-based mineral quartz. countable, uncountable

    "[…] I have for Trials sake taken Lumps of Rock Crystal, and Heating them Red hot in a Crucible, I found according to my Expectation, that being Quench’d in Fair water, even those that remain’d in seemingly entire Lumps, exchang’d their Translucency for Whiteness […]"

  2. 2
    a clear quartz used in making electronic and optical equipment wordnet

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