Chalcopyrite (Copper Sulfide), El Paso County, Texas
Chalcopyrite is an important Cu ore.
Locality: labeled as ore from the Pecos Mining Company, Sierra Diablo Range, in El Paso County, Texas.
Chemical Formula: CuFeS2
Crystal System: Tetragonal
Specimen size: 5 x 5 x 3 cm
Specimen weight: 375 grams
Collection ID: TMM-1765
Mineral resources of the United States, Calendar Year 1909 (p. 455) reports that the Hazel Mine in the Sierra Diablo range was and important Copper and Silver producer, and earlier reports (1902) report assays of 44% Cu from the Hazel Mine.