ANORTHITE  , an important See also:

• MINERAL

mineral of the See also:

• FELSPAR, or FELDSPAR

felspar See also:

• GROUP

group, being one of the end members of the See also:

• PLAGIOCLASE

plagioclase (q.v.) See also:

• SERIES (a Latin word from serere, to join)

series . It is a See also:

• CALCIUM [symbol Ca, atomic weight 40.0 (o= x6)]

calcium and See also:

• ALUMINIUM (symbol Al; atomic weight 27.0)

aluminium silicate, CaAl2SiaOs, and crystallizes in the anorthic See also:

• SYSTEM

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 (from the Lat. angulus, a corner, a diminutive, of which the primitive form, angus, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

angle of 85° 5o' . The See also:

• COLOUR (Lat. color, connected with celare, to hide, the root meaning, therefore, being that of a covering)

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, SIMON NAPOLEON (1855– )

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

gabbro and See also:

• BASALT

basalt, also of some meteoric stones . The best See also:

• DEVELOPED

developed crystals are those which accompany See also:

• MICA

mica, See also:

• AUGITE

augite, sanidine, &c., in the ejected blocks of metamorphosed See also:

• LIMESTONE

limestone from See also:

• MONTE

Monte Somma, the See also:

• ANCIENT
• ANCIENT (also spelt ANTIENT; derived, through the Fr. ancien, old, from the late Lat. antianum, from ante, before)

ancient portion 9 of See also:

• MOUNT, WILLIAM SIDNEY (1807-1868)

Mount See also:

• VESUVIUS (also Vesevus in ancient poets)

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

Japan, but are usually rare at other localities . The name anorthite was given to the Vesuvian mineral by G . See also:

• ROSE
• ROSE (Rosa)
• ROSE, GEORGE (1744-1818)
• ROSE, HUGH JAMES (1795—1838)
• ROSE, WILLIAM STEWART (1775-1843)

Rose in 1823, on See also:

• ACCOUNT
• ACCOUNT (through O. Fr. acont, Late Lat. comptum, cornputare, to calculate)

account of its anorthic See also:

• CRYSTALLIZATION

crystallization . The See also:

• SPECIES

species had, however, been earlier described by the See also:

• COMTE, AUGUSTE [ISIDORE AUGUSTE MARIE FRANCOIS XAVIER] (1798-1857)

comte de Bournon under the name indianite, this name being applied to a greyish or reddish granular mineral forming the See also:

• MATRIX

matrix of See also:

• CORUNDUM

corundum from the Carnatic in See also:

• INDIA
• INDIA, FRENCH

India . Several unimportant varieties have been distinguished .

(L . J .