fahlerzEnglishOxford New American Dictionaryfahlerz /ˈfälərts, ˈfɑlərts / ▸ noun a gray copper ore, of which tetrahedrite and tennantite are the typical minerals. – ORIGIN late 18th century : from German, from fahl ‘ash-colored’ + Erz ‘ore’.
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EnglishOxford New American Dictionary