Bornite, also known as peacock ore, is a sulfide mineral with chemical composition Cu5FeS4 that crystallizes in the orthorhombic system (pseudo-cubic).
Lightly iridescent bornite crystal on quartz needles, from Kazakhstan Specimen size: 3.6 cm × 2.2 cm × 1.2 cm (1.42 in × 0.87 in × 0.47 in)
Tarnish of bornite
Microscopic picture of Bornite
Bornite with silver from Zacatecas, Mexico (size: 7.5 × 4.3 × 3.4 cm)
The sulfide minerals are a class of minerals containing sulfide (S2−) or disulfide as the major anion. Some sulfide minerals are economically important as metal ores. The sulfide class also includes the selenides, the tellurides, the arsenides, the antimonides, the bismuthinides, the sulfarsenides and the sulfosalts. Sulfide minerals are inorganic compounds.
Pyrite
Stibnite
Realgar