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definition of the word quartz

by the Wiktionnary

German Quarz from Middle High German twarc, probably from a West Slavic language (cf. Polish twardy (hard), Russian твёрдый (hard)), from Old Church Slavonic тврьдъ (firm), from Proto-Slavic *tvьrdъ.

Singular
quartz

Plural
countable and uncountable; quartzes

quartz (countable and uncountable; plural quartzes)

  1. (mineralogy) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.


Definition from Wiktionary
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