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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.

ch Krupp, Essen, Germany, for washing pig iron, differing from the Bell process in using manganese as well as iron oxide, and performed in a Pernot furnace. Called also the Bell-Krupp process.

A phosphate of manganese and lithium; a variety of triphylite.

Magnetic elements. (a) (Chem. Physics) Those elements, as iron, nickel, cobalt, chromium, manganese, etc., which are capable or becoming magnetic. (b) (Physics) In respect to terrestrial magnetism, the declination, inclination, and intensity. (c) See under Element. -- Magnetic equator, the line around the equatorial p…

nd nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bismuth, etc.

melted cast iron is converted into steel by the addition of wrought iron, or iron ore and manganese, and by exposure to heat in an open-hearth furnace; -- also called the Siemens-Martin process, from the inventors. -- Open-hearth steel, steel made by an open-hearth process; -- also called Siemens-Martin steel. -- Ope…