rock crystal :

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rock crystal

  • n  a clear quartz used in making electronic and optical equipment
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  rock crystal
  • 'Rock Crystal' Tells Of Catastrophe's Quiet Avoidance
    Austrian writer Adalbert Stifter's 1845 novella Rock Crystal is the seemingly simple tale of two children who get lost in a snowfall on Christmas Eve. But author Susan Choi says the story perfectly captures humanity at its humblest and most resilient.
    July 7, 2013 - NPR

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