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Sphalerite has been found as a pseudomorph, taking the crystal structure of galena, tetrahedrite, barite and calcite. [13] [15] Sphalerite can have Spinel Law twins, where the twin axis is [111]. The chemical formula of sphalerite is (Zn,Fe)S; the iron content generally increases with increasing formation temperature and can reach up to 40%. [6]
Sphalerite from Tennessee, USA. (~8.5 centimetres (3.3 in) across at its widest) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties.
English: Sphalerite & barite from Tennessee, USA. (CMC RM 1140, Cincinnati Museum Center's rock & mineral collection, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, USA) Locality: Cumberland Mine, Smith County, Tennessee, USA
English: Black tetrahedral crystals of sphalerite up to 8 mm in size across this matrix (4.5 × 3.0 × 2.0 cm) with chalcopyrite and calcite. Found from Creede, Mineral County, Colorado, USA. Found from Creede, Mineral County, Colorado, USA.
English: Geologic context: sphalerite crystals atop sucrosic dolostone, Lockport Dolomite, upper Niagaran Series, Wenlockian, upper Middle Silurian Locality: Millersville Quarry, northern side of the town of Millersville, southwestern Sandusky County, northwestern Ohio, USA. Photo taken by James St. John.
Wurtzite is a zinc and iron sulfide mineral with the chemical formula (Zn,Fe)S, a less frequently encountered structural polymorph form of sphalerite. The iron content is variable up to eight percent. [5] It is trimorphous with matraite and sphalerite. [2] It occurs in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite ...
The zinc in sphalerite is also used to produce brass. This sample was extracted in Creede, Colorado, and features black tetrahedral crystals of sphalerite up to 8 mm (0.31 in) in size, with minor chalcopyrite and calcite, in a 4.5 cm × 3.0 cm × 2.0 cm (1.77 in × 1.18 in × 0.79 in) matrix.
[6] [24] [25] [26] In the eastern United States, pyrrhotite occurs in highly metamorphosed rock that forms a belt along the Appalachian Mountains. [6] Pyrrhotite-bearing rocks are generally unseen in the central United States as the area is unmetamorphosed and underlain by sedimentary rocks which do not contain pyrrhotite. [ 6 ]