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rock crystal
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rock crystal

noun

Definition of ROCK CRYSTAL

: crystal 1
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First Known Use of ROCK CRYSTAL

1666

rock crystal

noun    (Concise Encyclopedia)

Rock crystal from the Dauphiné region of France.—Emil Javorsky/EB Inc.

Transparent variety of the silica mineral quartz that is valued for its clarity and total lack of colour or flaws. Rock crystal formerly was used extensively as a gemstone, but it has been replaced by glass and plastic; rhinestones originally were quartz pebbles found in the Rhine River. The optical properties of rock crystal led to its use in lenses and prisms; its piezoelectric properties (see piezoelectricity) are used to control the oscillation of electrical circuits.

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