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SCHEELITE , a See also:mineral consisting of See also:calcium tungstate, CaWO4. It was See also:early known as " See also:tungsten " (meaning in See also:Swedish, " heavy See also:- STONE
- STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
- STONE, CHARLES POMEROY (1824-1887)
- STONE, EDWARD JAMES (1831-1897)
- STONE, FRANK (1800-1859)
- STONE, GEORGE (1708—1764)
- STONE, LUCY [BLACKWELL] (1818-1893)
- STONE, MARCUS (184o— )
- STONE, NICHOLAS (1586-1647)
stone "), and is the mineral in which K. W. See also:Scheele discovered tungstic See also:acid, hence the name scheelite. Well-See also:developed crystals are not infrequent; they usually have the See also:form of acute tetragonal bipyramids (P in fig.); sometimes other See also:pyramid-faces are See also:present, and these (g and n) being developed on only one See also:side of P indicate the parallel-faced hemihedrism of the crystals. Compact and granular masses also occur. The See also:colour is usually yellowish See also:- WHITE
- WHITE, ANDREW DICKSON (1832– )
- WHITE, GILBERT (1720–1793)
- WHITE, HENRY KIRKE (1785-1806)
- WHITE, HUGH LAWSON (1773-1840)
- WHITE, JOSEPH BLANCO (1775-1841)
- WHITE, RICHARD GRANT (1822-1885)
- WHITE, ROBERT (1645-1704)
- WHITE, SIR GEORGE STUART (1835– )
- WHITE, SIR THOMAS (1492-1567)
- WHITE, SIR WILLIAM ARTHUR (1824--1891)
- WHITE, SIR WILLIAM HENRY (1845– )
- WHITE, THOMAS (1628-1698)
- WHITE, THOMAS (c. 1550-1624)
white or brownish, the crystals sometimes transparent to translucent; the lustre vitreous to adamantine. The hardness is 41, the specific gravity 6•o. See also:Molybdenum " is usually present, replacing an See also:equivalent amount of tungsten; and in a See also:green variety known as " cupro-scheelite " See also:part of the calcium is replaced by See also:copper.
Scheelite usually occurs with See also:topaz, fluor, See also:apatite, See also:wolframite, &c., in See also:tin-
bearing See also:veins; and is sometimes found in association with See also:gold. See also:Fine crystals have been obtained from
Caldbeck Fells in See also:Cumberland, Zinnwald and Elbogen in Bohemia, Guttannen in See also:Switzerland, the See also:Riesengebirge in Siltsia, See also:Dragoon Mountains inArizona and elsewhere.
End of Article: SCHEELITE
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