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An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.

Cast steel containing a considerable percentage of manganese, which makes it very hard and tough. See Alloy steel, above.

g a notable quantity of some other metal alloyed with the iron, usually chromium, nickel, manganese, tungsten, or vanadium.

s approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.

of iron found in boggy or swampy land; a variety of brown iron ore, or limonite. (b) Bog manganese, the hydrated peroxide of manganese. -- Bog rush (Bot.), any rush growing in bogs; saw grass. -- Bog spavin. See under Spavin.

A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha.

ic luster, and high specific specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron; -- first found in New England.

in octahedral crystals, also massive, of a reddish color. It is a silicate of iron, zinc manganese, and glicinum, containing sulphur.

ng figures resembling shrubs or trees, produced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

Native carbonate of manganese; rhodochrosite.

A hydrous phosphate of alumina and manganese. It is generally of a rose-pink color, -- whence the name.

nar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

Steel hardened by the addition of other elements, as manganese, phosphorus, or (usually) carbon.

Native sulphide of manganese a reddish brown or brownish black mineral.

A mineral of a yellowish color, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur.

A mineral of brownish black color, occurring in columnar or foliated masses. It is native manganese tungstate.

s; as, hyposulphuric acid. Hyposulphuric acid, an acid, H2S2O6, obtained by the action of manganese dioxide on sulphur dioxide, and known only in a watery solution and in its salts; -- called also dithionic acid. See Dithionic.

of some extraneous substance formed on minerals. [R.] A thin crust or illinition of black manganese. Kirwan.

neral occurring in tufts of a straw-yellow color. It is a hydrous silicate of alumina and manganese.

f a gray, red, brown, or green color, and glistening luster. It is a silicate of iron and manganese.