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date: 30 November 2020

quartz (rock crystal) 

A Dictionary of Geology and Earth Sciences

Michael Allaby

Widely distributed rock‐forming *silicate mineral SiO2 with the related semi‐precious varieties rose quartz (pink), amethyst (purple), cairngorm (dark brown and similar to smoky quartz, although the original cairngorms from the Scottish mountain range were of ... ...

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