DIASPORE
This article appears in Volume V08, Page 169 of the Encyclopedia Britannica.
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Encyclopedia Britannica - Main :: DEM-DIO
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DIASPORE , a native aluminium hydroxide, AlO(OH), crystallizing in the orthorhombic system and isomorphous with gothite and manganite. It occurs sometimes as flattened crystals, but usually as lamellar or scaly masses, the flattened surface being a direction of perfect cleavage on which the lustre is markedly pearly in character. It is colourless or greyish-white 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)
, yellowish, sometimes violet in colour, and varies from translucent to
transparent. It may be readily distinguished from other colour-less transparent minerals, with a perfect cleavage and pearly lustremica, talc , brucite, gypsumby its greater hardness of 62-7. The specific gravity is 3.4. When heated before the blowpipe it decrepitates violently, breaking up into white 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)
pearly scales; it was because of this property that the mineral was named diaspore by R. J. Hairy in 18or, from Stavreipew, " to scatter." The mineral occurs as an alteration product of corundum or emery, and is found in granular limestone and other crystalline rocks. Well-developed crystals are found in the emery deposits of the Urals and at Chester, Massachusetts , and in kaolin at Schemnitz in Hungary . If obtainable in large quantity it would be of economic importance as a source of alumina. (L. J. S.)
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