MANGANITE  , a See also:

• MINERAL

mineral consisting of hydrated See also:

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

manganese sesquioxide, Mn20a•H20,crystallizing in the orthorhombic See also:

• SYSTEM

system and isomorphous with See also:

• DIASPORE

diaspore and See also:

• GOTHITE

gothite . Crystals are prismatic and deeply striated parallel to their length; they are often grouped together in bundles . The See also:

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

colour is dark See also:

• STEEL, FLORA ANNIE (1847– )

steel-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:

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

iron-See also:

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

black, and the lustre brilliant and submetallic: the streak is 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 . The hardness is 4, and the specific gravity 4.3 . There is a perfect cleavage parallel to the brachypinacoid, and less perfect cleavage parallel to the See also:

• PRISM (Gr. rrpivµa, properly a thing sawn, Irpii"ety, to saw)

prism faces m . Twinned crystals are not infrequent . The mineral contains 89'7% of manganese sesquioxide; it dissolves in hydrochloric See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid with See also:

• EVOLUTION

evolution of See also:

• CHLORINE (symbol Cl, atomic weight 35`46 (0=16)

chlorine . The best crystallized specimens are those from See also:

• ILFELD

Ilfeld in the Harz, where the mineral occurs with See also:

• CALCITE

calcite and See also:

• BARYTES

barytes in See also:

• VEINS

veins traversing See also:

• PORPHYRY (IlopcPisptos) (A.D. 233-c. 304)

porphyry . Crystals have also been found at See also:

• ILMENAU

Ilmenau in Thuringia, Neukirch near Schlett- stadt in See also:

• ALSACE (Ger. Elsass)

Alsace (" newkirkite "), Granam near Towie in See also:

• ABERDEENSHIRE

Aberdeenshire, Upton Pyne near See also:

• EXETER
• EXETER, EARL, MARQUESS AND DUKE OF

Exeter and See also:

• NEGAUNEE

Negaunee in See also:

• MICHIGAN
• MICHIGAN, LAKE
• MICHIGAN, UNIVERSITY OF

Michigan . As an ore of manganese it is much less abundant than pyrolusite or See also:

• PSILOMELANE

psilomelane . The name manganite was given by W . See also:

• HAIDINGER, WILHELM KARL, RITTER VON (1795-1871)

Haidinger in 1827: See also:

• FRENCH
• FRENCH, DANIEL CHESTER (1850– )
• FRENCH, NICHOLAS (1604-1678)

French authors adopt F .

S . See also:

• BEUDANT, FRANCOIS SULPICE (1787—1850)

Beudant's name " acerdese," (Gr . &Keptrls, unprofitable) because the mineral is of little value for See also:

• BLEACHING

bleaching purposes as compared with pyrolusite . (L . J .