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rock crystal

American  

noun

  1. transparent quartz, especially when colorless.


rock crystal British  

noun

  1. a pure transparent colourless quartz, used in electronic and optical equipment. Formula: SiO 2

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of rock crystal

First recorded in 1660–70

Example Sentences

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See Examples For:

The movement of thinner magma is also more difficult for seismometers to detect, which makes it harder for scientists to map the system of magma melts, rock, crystal and gas that feed eruptions.

From New York Times Dec. 3, 2022

The rock crystal panels are engraved with land and seascapes, and surrounded by floral-painted enamel.

From BBC Oct. 23, 2020

SUN All-ages presentation with rock, crystal and fossil hunter John Cornish, 1 p.m.

From Seattle Times Mar. 2, 2017

A luminous chunk of rock crystal sits atop a small plywood box, as if a crystal radio to Frida Kahlo's spirit world.

From Los Angeles Times Aug. 14, 2015

I hadn't had a freshwater bath in three weeks and was glistening with caked salt like a stick of rock crystal candy.

From "Hole in My Life" by Jack Gantos

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