FromMiddle High Germanquarz (14th c.,Bohemia), probably with theCentral German developmenttw- →qu- (as inquer etc.) from aWest Slavic language (compareCzechtvrdý,Polishtwardy), fromProto-Slavic*tvьrdъ(“hard”).
Quarz m (strong,genitiveQuarzes,pluralQuarze)
Quarz m (pluralQuarz)