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date: 28 November 2020

quartz 

Source:
A Dictionary of Chemistry
Author(s):
Jonathan LawJonathan Law, Richard RennieRichard Rennie

The most abundant and common mineral, consisting of crystalline silica (silicon dioxide, SiO2), crystallizing in the trigonal system. It has a hardness of 7 on the Mohs scale. Well-formed crystals of quartz are six-sided prisms terminating in six-sided pyramids. Quartz is ordinarily colourless and transparent, in which form it is known as ... ...

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