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ANORTHITE , an important See also:mineral of the See also:felspar See also:group, being one of the end members of the See also:plagioclase (q.v.) See also:series. It is a See also:calcium and See also:aluminium silicate, CaAl2SiaOs, and crystallizes in the anorthic See also:system. Like all the felspars, it possesses two cleavages, one perfect and the other less so, here inclined to one another at an See also:angle of 85° 5o'. The See also:colour is 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, greyish or reddish, and the crystals are trans-See also:parent to translucent. The hard-
ness is 6-61, and the specific gravity 273.
Anorthite is an essential constituent of many basic igneous rocks, such as See also:gabbro and See also:basalt, also of some meteoric stones. The best See also:developed crystals are those which accompany See also:mica, See also:augite, sanidine, &c., in the ejected blocks of metamorphosed See also:limestone from
See also:Monte Somma, the See also:ancient portion 9
of See also:Mount See also:Vesuvius; these are Anorthite. perfectly colourless and transparent, and are bounded by numerous brilliant faces. Distinctly developed crystals are also met with in the basalts of See also:Japan, but are usually rare at other localities.
The name anorthite was given to the Vesuvian mineral by G. See also:Rose in 1823, on See also:account of its anorthic See also:crystallization. The See also:species had, however, been earlier described by the See also:comte de Bournon under the name indianite, this name being applied to a greyish or reddish granular mineral forming the See also:matrix of See also:corundum from the Carnatic in See also:India. Several unimportant varieties have been distinguished. (L. J.
End of Article: ANORTHITE
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