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Chalcopyrite (/ ˌ k æ l k ə ˈ p aɪ ˌ r aɪ t,-k oʊ-/ [7] [8] KAL-kə-PY-ryte, -koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS 2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale.
Sperrylite on chalcopyrite with magnetite, Oktyabersky Mine, Norilsk. Field of view 2.2 cm. Field of view 2.2 cm. Sperrylite is a platinum arsenide mineral with the chemical formula PtAs 2 and is an opaque metallic tin white mineral which crystallizes in the isometric system with the pyrite group structure.
It has the chemical formula CuFe 2 S 3 and when found, it has a bronze to brass-yellow appearance. On the Mohs hardness scale, cubanite falls between 3.5 and 4 and has a orthorhombic crystal system. [2] Cubanite is chemically similar to chalcopyrite; however, it is the less common copper iron sulfide mineral due to crystallization requirements.
Chalcocite crystals from the Mammoth Mine, Mount Isa – Cloncurry area, Queensland, Australia (size: 3.0 x 2.9 x 2.4 cm) Since chalcocite is a secondary mineral that forms from the alteration of other minerals, it has been known to form pseudomorphs of many different minerals.
Bornite is an important copper ore mineral and occurs widely in porphyry copper deposits along with the more common chalcopyrite.Chalcopyrite and bornite are both typically replaced by chalcocite and covellite in the supergene enrichment zone of copper deposits.
Chalcophyllite crystallizes in the trigonal crystal class, 3 2/m with space group R 3m [5] or 3 with space group R 3. [2] [3] [4] [6] Some authors choose a unit cell with three formula units per cell (Z = 3), and some a smaller unit cell with only 1.5 formula units per cell (Z = 1.5). For the larger unit cell a = 10.77 Å, c = 57.5 Å, Z = 3.
Eskebornite is a selenide mineral with the formula Cu Fe Se 2. [2] [3] It crystallizes in the tetragonal system and it has a brassy colour. Eskebornite is sometimes found as thick tabular crystals, but is more often found intergrown with other selenides. [4] It is part of the chalcopyrite group and forms a series with chalcopyrite. [5]
The formula is Cu 31 S 16, molar mass 2483 g, and there are 8 formula units per unit cell (Z = 8). The crystal class is 2/m, meaning the structure has an axis of twofold rotational symmetry perpendicular to a mirror plane. The space group is P2 1 /c, and the unit cell parameters are a = 26.897 Å, b = 15.745