RHODOCHROSITE  , a See also:

• MINERAL

mineral See also:

• SPECIES

species consisting of See also:

• MANGANESE (symbol Mn; atomic weight, 54.93 (0=16)], a metallic chemical element. Its dioxide (pyrolusite)

manganese carbonate, MnCO3, crystallizing in the See also:

• RHOMBOHEDRAL

rhombohedral See also:

• SYSTEM

system and isomorphous with See also:

• CALCITE

calcite . It usually occurs as cleavable, compact or botryoidal masses, distinct crystals being somewhat rare; these often have the See also:

• FORM (Lat. forma)

form of the See also:

• PRIMITIVE

primitive rhombohedron, parallel to the faces of which there are perfect cleavages . When pure, the mineral contains 47.7% of manganese, but this is usually partly replaced by varying amounts of See also:

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

iron, and sometimes by See also:

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

calcium, See also:

• MAGNESIUM [symbol Mg, atomic weight 24.32 (0 = 16)]

magnesium, See also:

• ZINC

zinc, or rarely See also:

• COBALT (symbol Co, atomic weight 59)

cobalt (cobalt-manganese-spar) . With these See also:

• VARIATIONS
• VARIATIONS, CALCULUS
• VARIATIONS, CALCULUS OF

variations in chemical See also:

• COMPOSITION
• COMPOSITION (Lat. compositio, from componere, to put together)

composition the specific gravity varies from 3.45 to 3.6o; the hardness is 4 . The See also:

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

colour is usually See also:

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

rose-red, but may sometimes be See also:

• GREY, CHARLES GREY, 2ND EARL (1764-1845)
• GREY, HENRY GREY, 3RD EARL (1802-1894)
• GREY, LADY JANE (1537-1554)
• GREY, SIR EDWARD
• GREY, SIR GEORGE (1812–1898)

grey to 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 . The name rhodochrosite, from the See also:

• GREEK
• GREEK, ETRUSCAN AND

Greek /Soso-xptes (rose-coloured), has reference to the characteristic colour of the mineral: manganese-spar and dialogite are synonyms . It is found in mineral See also:

• VEINS

veins with ores of See also:

• SILVER

silver, See also:

• LEAD
• LEAD (pronounced iced)

lead, See also:

• COPPER (symbol Cu, atomic weight 63.1, H=1, or 63.6, O = 16)

copper, &c., or in' deposits of manganese ore . Crystals have been met with in the mines at Kapnik-Banya and Nagyag near See also:

• DEVA (mod. Chester)
• DEVA (Sanskrit " heavenly ")

Deva in Transylvania and at See also:

• DIEZ
• DIEZ, FRIEDRICH CHRISTIAN (1794–1876)

Diez in See also:

• NASSAU

Nassau, but by far the best specimens are from See also:

• COLORADO

Colorado . The mineral is used to a limited extent in the manufacture of spiegeleisen and ferromanganese .