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MANGANITE , a See also:mineral consisting of hydrated See also:manganese sesquioxide, Mn20a•H20,crystallizing in the orthorhombic See also:system and isomorphous with See also:diaspore and See also:gothite. Crystals are prismatic and deeply striated parallel to their length; they are often grouped together in bundles. The See also:colour is dark See also:steel-See also:grey to See also:iron-See also: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 faces m. Twinned crystals are not infrequent. The mineral contains 89'7% of manganese sesquioxide; it dissolves in hydrochloric See also:acid with See also:evolution of See also:chlorine. The best crystallized specimens are those from See also:Ilfeld in the Harz, where the mineral occurs with See also:calcite and See also:barytes in See also:veins traversing See also:porphyry. Crystals have also been found at See also:Ilmenau in Thuringia, Neukirch near Schlett-
stadt in See also:Alsace (" newkirkite "), Granam near Towie in See also:Aberdeenshire, Upton Pyne near See also:Exeter and See also:Negaunee in See also:Michigan. As an ore of manganese it is much less abundant than pyrolusite or See also:psilomelane. The name manganite was given by W. See also:Haidinger in 1827: See also:French authors adopt F. S. See also:Beudant's name " acerdese," (Gr. &Keptrls, unprofitable) because the mineral is of little value for See also:bleaching purposes as compared with pyrolusite.
(L. J.
End of Article: MANGANITE
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