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RHODONITE , a member of the See also:pyroxene See also:group of minerals, consisting of See also:manganese metasilicate, MnSiO3, and crystallizing in the anorthic See also:system. It commonly occurs as cleavable to compact masses with a See also:rose-red See also:colour; hence the name, from the See also:Greek 1 YSov (a rose). Crystals often have a thick See also:tabular See also:habit; there are perfect cleavages parallel to the See also:prism faces with an See also:angle of 87° 312'. The hardness is 52-627 and the specific gravity 3.4-3.68. The manganese is often partly replaced by See also:iron and See also:calcium, which may sometimes be See also:present in considerable amounts; a greyish-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 variety containing as much as 20% of calcium See also:oxide is called " bustamite " ; " fowlerite " is a zinciferous variety containing 7% of See also:zinc oxide. Rhodonite is a See also:mineral liable to alteration, with the formation of manganese carbonate, hydrous silicate or oxides. The compact material, which is cut and polished for ornamental purposes, is often marked in a striking manner by See also:veins and patches of these See also:black alteration products. At Syedelnikova, near See also:Ekaterinburg in the Urals, compact material of a See also:good colour occurs in a See also:clay-See also:slate and is extensively quarried: boulders of similar material found at Cummington ,in See also:Massachusetts (" cummingtonite f7) have also been worked as an ornamental See also:- STONE
- STONE (0. Eng. shin; the word is common to Teutonic languages, cf. Ger. Stein, Du. steen, Dan. and Swed. sten; the root is also seen in Gr. aria, pebble)
- STONE, CHARLES POMEROY (1824-1887)
- STONE, EDWARD JAMES (1831-1897)
- STONE, FRANK (1800-1859)
- STONE, GEORGE (1708—1764)
- STONE, LUCY [BLACKWELL] (1818-1893)
- STONE, MARCUS (184o— )
- STONE, NICHOLAS (1586-1647)
stone. In the iron and manganese mines at Pajsberg near Filipstadt and Langban in Vermland, See also:Sweden, small brilliant and translucent crystals (" pajsbergite ") and cleavage masses occur. Fowlerite occurs as large, rough crystals, somewhat resembling See also:pink See also:felspar, with See also:franklinite and zinc ores in granular See also:limestone at See also:Franklin See also:Furnace in New See also:Jersey.
End of Article: RHODONITE
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