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Sulfur: Forms
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Sulfur is found in every living cell. It's part of the molecules that form the amino acids (protein building blocks) methionine, cysteine, and taurine, which are essential for health. It's a constituent of vitamin B1 and biotin, the antioxidant glutathione, the anticoagulant heparin, and coenzyme A, which drives energy production in cells. Sulfur is an integral part of the biological cement that forms skin, hair, nails, and the cartilage that shapes your nose and pads your joints.
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Sulfur is found in Group 16 of the periodic table. It exhibits allotropy. Solid sulfur occurs principally in three forms, all of which are brittle, yellow in color, odorless, tasteless, and insoluble in water. Two of these solid forms are crystalline, composed of molecules containing eight sulfur atoms and having molecular weight 256.512 amu. Rhombic sulfur has orthorhombic crystalline structure and is stable below 95.5°C; most sulfur is in this form. The monoclinic, or prismatic, form has long, needlelike, nearly transparent crystals; it is stable between 95.5°C and its melting point but reverts to the rhombic form on standing at room temperature. Amorphous sulfur is a dark, noncrystalline, gumlike substance.
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Sulfur is soft, light in weight, and very brittle. Therefore, care must be exercised when handling and storing specimens. When kept moist or not allowed to dry when wet, hydrogen will mix with the Sulfur, forming hydrogen sulfide (H2S), which causes the deterioration of a specimen. To prevent this, Sulfur should not be stored under humid conditions. (See Storing minerals for more information). It is best not to wash Sulfur specimens, as warm water will dissolve it. Sulfur ... the tendency to crack when exposed to even mild heat, including body heat.
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Sulfur ... combines with most other elements. Sometimes it combines with them easily at room temperature. In other cases, it must be heated. The reaction between magnesium and sulfur is typical. When the two elements are heated, they combine to form magnesium sulfide (MgS):
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Sulfur ... occurs in natural gas and petroleum crudes and must be removed from these products. Formerly this was done chemically, which wasted the sulfur; new processes now permit recovery. Large amounts of sulfur are being recovered from Alberta gas fields.
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Sulfur is considered non-toxic to birds (7). The 8-day dietary LC50 for bobwhite quail is reported to be greater than 5,620 ppm in a study using a 95% sulfur wettable powder formulation (9). In studies on ecological effects involving bobwhite quail, sulfur has been shown to be practically non-toxic to the species tested (8).
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