witherite


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witherite:

see carbonatecarbonate
, 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

 

(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

witherite

[′with·ə‚rīt]
(mineralogy)
BaCO3 A yellowish- or grayish-white mineral of the aragonite group that has orthorhombic symmetry, hardness of 3¼ on Mohs scale, and specific gravity 4.3.
References in periodicals archive ?
Although the solubility product values of calcite and witherite are very close, about [10.
Following the 1889 meeting of the British Association for the Advancement of Science, for example, he made the rounds in Cumberland with "a leading mineralogist," acquiring "butterfly" calcite, barite, fluorite, witherite, alstonite.
However, when the higher barium-content witherite from nearby Nentsberry came onto the market, the demand for the lower-quality Blagill material disappeared and there are no production records after 1895.
He said: "I've kept three scrap books of old photographs, old drawings of the mine workings, pieces of Witherite and I've still got the sign from one of the steam engines in the Ellen Shaft.
Although exploratory work revealed good witherite ore in the lower 90 feet of the old lead workings, witherite was never mined there.
Mineralization consists primarily of galena with massive barite and accessory fluorite, witherite, calcite and quartz.
In the 1850s the Caldbeck mines were yielding wonderful lead and copper minerals, and some of the world's finest fluorite and witherite was being found in abundance in the Northern Pennines.
Minerals listed by Alfors and Pabst (1984) from this prospect include sanbornite, fresnoite, krauskopfite, titantaramellite, barite, witherite and celsian.
Associated minerals are: celsian, fresnoite, macdonaldite, pyrrhotite, titantaramellite, traskite, witherite, two new minerals and a hydrated form of Si[O.
The mineral deposits which lie beneath the Pennine Hills of Northern England have been mined for centuries and are known to collectors worldwide for fine specimens of fluorite, barite and witherite.
But the gallery is totally lacking in fine barite, bournonite, witherite and liroconite, and even the Weardale fluorites left much to be desired.
Trumbull Peak is one of several barium silicate occurrences located along the western margin of North America; it hosts such minerals as alforsite, celsian, gillespite, macdonaldite, pellyite, titantaramellite and witherite, and is the type locality for sanbornite.