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Witherite

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witherite: see carbonate carbonate , chemical compound containing the carbonate radical or ion, CO3−2. Most familiar carbonates are salts that are formed by reacting an inorganic base (e.g., a metal hydroxide) with carbonic acid.
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witherite [′with·ə‚rīt]
(mineralogy)
BaCO3A yellowish- or grayish-white mineral of the aragonite group that has orthorhombic symmetry, hardness of 3¼ on Mohs scale, and specific gravity 4.3.

Witherite 

(named for the British scientist W. Withering, 1741-99), a mineral; chemical formula BaCO3. It occurs as white, grayish, or yellow continuous gemmiform or fibrous crystalline masses; less frequently as fine rhombic crystals. Density, 4,270-4,350 kg/m3; hardness on the mineralogical scale, 3.5-4.0. In nature witherite is formed from hot internal water; it occurs in veins, sometimes along with barite, galena, and sphalerite. On the earth’s surface witherite readily becomes secondary barite. Witherite can be used as the ore for producing barium and its salts. Deposits of it are rare.

G. P. BARSANOV



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At its closure in 1968, it had produced 630,000 tons of witherite ( about half of the world's output.
ankerite, siderite, witherite, strontianite, may form if the respective metal cations are available.
Sara Witherite, RR 1 Box 684CC, Osceola Mills, PA 16666.
 
 
 
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