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STAUROLITE , a See also:mineral consisting of basic See also:aluminium and ferrous See also:iron silicate with the See also:formula HFeA15Si2O13. The material is, however, usually very impure, the crystals enclosing sometimes as much as 30 or 40% of See also:quartz and other minerals as well as carbonaceous See also:matter. Crystals are orthorhombic and have the See also:form of six-sided prisms. Interpenetrating cruciform twinned crystals are very See also:common and characteristic; they were See also:early known as pierres de croix or lapis crucifer, and the name staurolite, given by J. C. Delametherie in 1792, has the same meaning (See also:Greek, aeavpos, a See also:cross, and XWBos, a 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). In fig. r the twin-See also:plane is (032) and the two prisms intercross
Twinned Crystals of Staurolite.
at an See also:angle of 91° 22'; in fig. 2 the twin-plane is (232) and the prisms intercross at nearly 6o°. The mineral is translucent to opaque and dark reddish-See also:- BROWN
- BROWN, CHARLES BROCKDEN (1771-181o)
- BROWN, FORD MADOX (1821-1893)
- BROWN, FRANCIS (1849- )
- BROWN, GEORGE (1818-188o)
- BROWN, HENRY KIRKE (1814-1886)
- BROWN, JACOB (1775–1828)
- BROWN, JOHN (1715–1766)
- BROWN, JOHN (1722-1787)
- BROWN, JOHN (1735–1788)
- BROWN, JOHN (1784–1858)
- BROWN, JOHN (1800-1859)
- BROWN, JOHN (1810—1882)
- BROWN, JOHN GEORGE (1831— )
- BROWN, ROBERT (1773-1858)
- BROWN, SAMUEL MORISON (1817—1856)
- BROWN, SIR GEORGE (1790-1865)
- BROWN, SIR JOHN (1816-1896)
- BROWN, SIR WILLIAM, BART
- BROWN, THOMAS (1663-1704)
- BROWN, THOMAS (1778-1820)
- BROWN, THOMAS EDWARD (1830-1897)
- BROWN, WILLIAM LAURENCE (1755–1830)
brown in See also:colour; it thus has a certain resemblance to See also:garnet, and on this See also:account has been called grenatite. Waterworn pebbles of material sufficiently trans-See also:parent for cutting as See also:gem-stones are occasionally found in the diamantiferous sands of See also:Brazil. The hardness is 72 and the specific gravity 3.75. Staurolite is a characteristic mineral of crystalline See also:schists, and it is also a product of contact-See also:metamorphism. Large twinned crystals with rough surfaces are found in See also:mica-schist in See also:Brittany and at several places in the See also:United States, e.g. in Fannin See also:county, See also:Georgia. Untwinned crystals, translucent and of a See also:rich brown colour (grenatite), are abundant in the silvery 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 paragonite-schist of See also:Monte Campione, St Gothard. (L. J.
End of Article: STAUROLITE
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