CHROMITE  , a member of the See also:

• SPINEL

spinel See also:

• GROUP

group of minerals; an See also:

• OXIDE

oxide of See also:

• CHROMIUM (symbol Cr. atomic weight 52.1)

chromium and ferrous See also:

• IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron, FeCr2O4 . It is also known as chromic iron or as chrome-iron-ore, and is the See also:

• CHIEF (from Fr. chef, head, Lat. caput)

chief commercial source of chromium and its compounds . It crystallizes in See also:

• REGULAR

regular octahedra, but is usually found as grains or as granular to compact masses . In its iron-See also:

• BLACK
• BLACK, ADAM (1784-1874)
• BLACK, JEREMIAH SULLIVAN (1810–1883)
• BLACK, WILLIAM (1841-1898)

black See also:

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

colour with submetallic lustre and See also:

• ABSENCE (Lat. absentia)

absence of cleavage it resembles See also:

• MAGNETITE

magnetite (magnetic iron-ore) in See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance, but differs from this in being only slightly if at all magnetic and in the 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 colour of its See also:

• POWDER (through O. Fr. puldre, modern poudre, from Lat. pulvis, pulveris, dust)

powder . The hardness is 51; specific gravity 4.5 . The theoretical See also:

• FORMULA
• FORMULA (Lat. diminutive of forma, shape, pattern, &c., especially used of rules of judicial procedure)

formula FeCr2O4 corresponds with chromic oxide (Cr203) 68%, and ferrous oxide 32%; the ferrous oxide is, however, usually partly replaced by See also:

• MAGNESIA

magnesia, and the chromic oxide by alumina and ferric oxide, so that there may be a See also:

• GRADUAL (Med. Lat. gradualis, of or belonging to steps or degrees; gradus, step)

gradual passage to picotite or chromespinel . Much of the material See also:

• MINED

mined as ore does not contain more than 40 to 50% of chromic oxide . In the See also:

• FORM (Lat. forma)

form of isolated grains the See also:

• MINERAL

mineral is a characteristic constituent of ultrabasic igneous rocks, namely the peridotites and the serpentines which have resulted from their alteration . It is also found under similar conditions in meteoric stones and irons . Often these rocks enclose large segregated masses of granular chromite . The earliest worked deposits were those in the See also:

• SERPENTINE

serpentine of the See also:

• BARE

Bare Hills near See also:

• BALTIMORE
• BALTIMORE, GEORGE CALVERT, 1ST BARON (C. 1580—1632)

Baltimore, See also:

• MARYLAND

Maryland, U.S.A.; it was also formerly extensively mined in See also:

• LANCASTER
• LANCASTER, HOUSE OF
• LANCASTER, JOHN OF GAUNT
• LANCASTER, JOSEPH (1778-1838)
• LANCASTER, SIR JAMES (f1. 1591—1618)
• LANCASTER, THOMAS, EARL OF (c. 1277-1322)

Lancaster See also:

• COUNTY (through Norm. Fr. comae, cf. O. Fr. cunte, conk', Mod. Fr. comae, from Lat. comitatus, cf. Ital. comitato, Prov. comtat; see COUNT)

county, See also:

• PENNSYLVANIA
• PENNSYLVANIA, UNIVERSITY OF

Pennsylvania, and is now mined in See also:

• CALIFORNIA
• CALIFORNIA, LOWER (Baja California)
• CALIFORNIA, UNIVERSITY OF

California, as well as in See also:

• TURKEY

Turkey, the Urals, Dun See also:

• MOUNTAIN (0. Fr. montaigne; popular Lat. montanea, an adjectival form from the classical mons, montis, whence Eng. " mount," a form usually used along with the name of an individual mountain, e.g. Mt Everest)
• MOUNTAIN, THE (La Montagne)

Mountain near See also:

• NELSON
• NELSON, HORATIO NELSON, VISCOUNT (1758-1805)
• NELSON, ROBERT (s656-1715)

Nelson in New See also:

• ZEALAND (also SEALAND Or SEELAND; Danish Sjaelland)

Zealand, and Unst in the Shetlands . Chrome-iron-ore is largely used in the preparation of chromium compounds for use as See also:

• PIGMENTS (Lat. pigmentum, from pingere, to paint)

pigments (chrome-yellow, &c.) and in See also:

• CALICO

calico-See also:

• PRINTING (from Lat. imprimere, O. Fr. empreindre)

printing; it is also used in the manufacture of chrome-See also:

• STEEL, FLORA ANNIE (1847– )

steel .

(L . J .