From German Quarz, from Middle High German (Central East German) quarz, from (dialectal) Polish kwardy (“hard”) [compare Polish twardy (“hard”), Czech tvrdý (“hard”), , Russian твёрдый (tvjórdyj, “hard”)], from Old Church Slavonic тврьдъ (tvrĭdŭ, “firm”), from Proto-Slavic *tvьrdъ.
- (Received Pronunciation) IPA(key): /kwɔːts/
- (General American) IPA(key): /kwɔɹts/, /kɔɹts/
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- (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.