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English

From German Quarz, from Middle High German (Central East German) quarz, twarc, from a West Slavic language [compare Polish twardy (hard), Czech tvrdý (hard), Russian твёрдый (tvjórdyj, hard)], from Old Church Slavonic тврьдъ (tvrĭdŭ, firm), from Proto-Slavic *tvьrdъ.