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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]
English: Galena, Sphalerite, Marcasite Locality: Viburnum Trend District, Reynolds County, Missouri, USA (Locality at mindat.org) Cubes of galena to 1.5 cm on a matrix of sphalerite, with a ball of sparkly marcasite in one place. A classic Viburnum Trend combination - from the collection of Ed Ruggiero. 9.6 x 6.2 x 5.7cm
This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment.
Galena is the main ore of lead, used since ancient times, [6] since lead can be smelted from galena in an ordinary wood fire. [7] Galena typically is found in hydrothermal veins in association with sphalerite, marcasite, chalcopyrite, cerussite, anglesite, dolomite, calcite, quartz, barite, and fluorite.
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.
Rock and dust samples retrieved by NASA from the asteroid Bennu exhibit some of the chemical building blocks of life, according to research that provides some of the best evidence to date that ...
Gem-quality material is usually a strong yellow to honey brown, orange, red, or green; its very high RI (2.37) and dispersion (0.156) make for an extremely lustrous and fiery gem, and it is also isotropic. But here again, its low hardness (2.5–4) and perfect dodecahedral cleavage preclude sphalerite's wide use in jewelry.
Streak can be used when properties between pyrrhotite and other sulfide minerals are similar. Pyrrhotite displays a dark grey to black streak. [ 15 ] Pyrite will display a greenish black to brownish black streak, [ 16 ] chalcopyrite will display a greenish black streak, [ 17 ] and pentlandite leaves a pale bronze-brown streak. [ 18 ]
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