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Sulfur: Forms
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Sulfur is a mineral needed for the manufacture of many proteins, including those forming hair, muscles, and skin. Sulfur contributes to fat digestion and absorption, because it is needed to make bile acids. Sulfur is ... a constituent of bones, teeth, and collagen (the protein in connective tissue). As a component of insulin, sulfur is needed to regulate blood sugar. Sulfur is present in methylsulfonylmethane (MSM), a naturally-occurring substance available as a supplement.
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Sulfur is an acid-forming mineral. It is part of the chemical structure of amino acids (the building blocks of protein): cysteine (keratin), taurine (component of bile to digest fats), and glutathione (an antioxidant). Sulfur cleanses the blood, helps the body to fight bacteria, and protects cells.
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Sulfur has a nominal density of 2 gm/cm3, but in its rhombic crystalline form it has a density of 5.4 gm/cm3. Besides being found in pure form, sulfur can be found in minerals like gypsum, CaSO4.2H2O . Both sulfides and sulfates are important classes of minerals.
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Sulfur exists in two allotropic forms. Allotropes are forms of an element with different physical and chemical properties. The two forms of sulfur are known as α-form and β-form (the Greek letters alpha and beta, respectively). Both allotropes are yellow, with the α-form a brighter yellow and the β-form a paler, whitish-yellow. The α-form changes to the β-form at about 94.5°C (202°F). The α-form can be melted at 112.8°C (235.0°F) if it is heated quickly.
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Sulfur supplements are available in two main forms -- dimethyl sulfoxide (DMSO) and methylsulfonylmethane (MSM). Each of these substances, first DMSO in the 1960s and 1970s and more recently MSM, has been touted to treat many conditions, particularly those related to pain. The only use for which DMSO is approved by the FDA is interstitial cystitis (inflammation of the bladder), which is injected under medical supervision.
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Sulfur is widely distributed in nature. It is found in many minerals and ores, e.g., iron pyrites, galena, cinnabar, zinc blende, gypsum, barite, and epsom salts and in mineral springs and other waters. It is found uncombined in some volcanic regions and in large underground deposits in Sicily and in Texas and Louisiana. Sulfur often occurs with coal, petroleum, and natural gas. Sulfur is found in meteorities, and deposits of it may be present near the lunar crater Aristarchus. The distinctive colors of Jupiter’s moon Io are believed to result from forms of molten, solid, and gaseous sulfur.
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