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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.
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]
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.
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.
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.
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.
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.
[3] [6] The monoclinic variety crystallises in the prismatic 2/m class, space group C2/m. [4] [5] [7] Unit cell parameters Monoclinic variety: There are two formula units per unit cell (Z = 2), the lengths of the sides of the unit cell are a = 12.64 Å, b = 7.29 Å, c = 11.90 Å and the angle between the c and a directions is β = 90.0°. [4] [5]