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Sulfate minerals include: Anhydrous sulfates. Barite BaSO 4. Celestite SrSO 4. Anglesite PbSO 4. Anhydrite CaSO 4. Hanksite Na 22 K (SO 4) 9 (CO 3) 2 Cl. Hydroxide and hydrous sulfates. Gypsum CaSO 4 ·2H 2 O. Chalcanthite CuSO 4 ·5H 2 O. Kieserite MgSO 4 ·H 2 O. Starkeyite MgSO 4 ·4H 2 O. Hexahydrite MgSO 4 ·6H 2 O. Epsomite MgSO 4 ·7H 2 O.
Sulfate mineral, any naturally occurring salt of sulfuric acid. About 200 distinct kinds of sulfates are recorded in mineralogical literature, but most of them are of rare and local occurrence. Abundant deposits of sulfate minerals, such as barite and celestite, are exploited for the preparation of.
NameColourLustreMohs Hardnessalumcolourless; whitevitreous2–2½alunitewhite; grayish, yellowish, reddish, ...vitreous3½–4alunogenwhite; yellowish or reddishvitreous to silky1½–2anglesitecolourless to white; often tinted gray, ...adamantine to resinous or vitreous2½–3- The Editors of Encyclopaedia Britannica
Aug 28, 2022 · More than 100 sulfate minerals are known, and most are rare. Gypsum and anhydrite are the only rock-forming sulfates. Sulfates, like borates and nitrates, are common minerals in evaporite deposits. They are also, however, found as secondary minerals in many different kinds of rocks.
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- Alunite. Alunite is a hydrous aluminum sulfate, KAl3(SO4)2(OH)6, from which alum is manufactured. Alunite is also called alumite. It has a Mohs hardness of 3.5 to 4 and coloring in white to flesh-red.
- Anglesite. Anglesite is lead sulfate, PbSO4. It is found in lead deposits where the sulfide mineral galena is oxidized and is also called lead spar.
- Anhydrite. Anhydrite is calcium sulfate, CaSO4, similar to gypsum but without its water of hydration. The name means "waterless stone," and it forms where low heat drives the water out from gypsum.
- Barite. Barite is barium sulfate (BaSO4), a heavy mineral that commonly occurs as concretions in sedimentary rocks. In the loose sandstones of Oklahoma, barite forms "roses."
Aug 28, 2022 · Mineralogists have described more than 100 sulfate minerals. They fall into two main groups: those that contain water (hydrous sulfates) and those that do not (anhydrous sulfates). Gypsum (CaSO 4 •2H 2 O) is the only common hydrous sulfate.
Jan 1, 2018 · Definition. Sulfate minerals are mineral species in which the dominant anionic entity is the sulfate anion, [SO 4] 2− (Chang et al. 1996; Alpers et al. 2000 ). About 380 valid species of sulfate minerals had been described by early 2017 (cf. www.mindat.org ), which are often grouped into a broader “sulfate” anion class along with the much ...
Mineral - Sulfates, Crystals, Properties: This class is composed of a large number of minerals, but relatively few are common. All contain anionic (SO4)2– groups in their structures. These anionic complexes are formed through the tight bonding of a central S6+ ion to four neighbouring oxygen atoms in a tetrahedral arrangement around the sulfur.
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