rock crystal

noun

clear, colourless form of the silica-based mineral quartz, often called "pure quartz" or "clear quartz".

She admired the beautiful rock crystal on display.

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意味（1）

clear, colourless form of the silica-based mineral quartz, often called "pure quartz" or "clear quartz".

[…] 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 […]

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rock crystal

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