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Blueschist on Île de Groix, France Photomicrograph of a thin section of blueschist facies metamorphosed basalt, from Sivrihisar, Turkey. Blueschist (/ ˈ b l uː ʃ ɪ s t /), also called glaucophane schist, is a metavolcanic rock [1] that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low temperatures (200–500 °C (392–932 °F ...
Carnallite (also carnalite) is an evaporite mineral, a hydrated potassium magnesium chloride with formula KCl.MgCl 2 ·6(H 2 O). It is variably colored yellow to white, reddish, and sometimes colorless or blue.
Halite forms isometric crystals. [10] The mineral is typically colorless or white, but may also be light blue, dark blue, purple, pink, red, orange, yellow or gray depending on inclusion of other materials, impurities, and structural or isotopic abnormalities in the crystals. [11]
Calcite. Manganoan calcite (var.); Caledonite; Canasite; Cancrinite. Vishnevite; Carletonite; Carnallite; Cassiterite; Catapleiite; Cavansite; Celestite; Ceruleite ...
Halite and sylvite commonly form as evaporites, and can be dominant minerals in chemical sedimentary rocks. Cryolite , Na 3 AlF 6 , is a key mineral in the extraction of aluminium from bauxites ; however, as the only significant occurrence at Ivittuut , Greenland , in a granitic pegmatite, was depleted, synthetic cryolite can be made from fluorite.
The thick halite beds of the Prairie Evaporite Formation are essentially impermeable, and numerous solution caverns have been artificially created in them to store natural gas and liquified petroleum gas products. [8] Storage of nuclear waste, carbon dioxide, and other waste products has also been discussed. [1]
A reptile tooth and a fish tooth from the Blue Anchor Formation, Somerset The formation is named from the village of Blue Anchor on the coast of west Somerset. It consists largely of green to grey mudstones and siltstones (which gave rise to the earlier name of this sequence, the Tea-green Marls) and varies from around 5 m to 67 m in thickness.
Anhydrite is 1–3% of the minerals in salt domes and is generally left as a cap at the top of the salt when the halite is removed by pore waters. The typical cap rock is a salt, topped by a layer of anhydrite, topped by patches of gypsum, topped by a layer of calcite. [8]