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Helvite :: Helvite (n.) A mineral of a yellowish color, consisting chiefly of silica, glucina, manganese, and iron, with a little sulphur..

Karpholite :: Karpholite (n.) A fibrous mineral occurring in tufts of a straw-yellow color. It is a hydrous silicate of alumina and manganese.

Pyrolusite :: Pyrolusite (n.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name)..

Triphylite :: Triphylite (n.) A mineral of a grayish-green or bluish color, consisting of the phosphates of iron, manganese, and lithia..

Sienna :: Sienna (n.) Clay that is colored red or brown by the oxides of iron or manganese, and used as a pigment. It is used either in the raw state or burnt..

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

Zaffer :: Zaffer (n.) A pigment obtained, usually by roasting cobalt glance with sand or quartz, as a dark earthy powder. It consists of crude cobalt oxide, or of an impure cobalt arseniate. It is used in porcelain painting, and in enameling pottery, to produce a blue color, and is often confounded with smalt, from which, however, it is distinct, as it contains no potash. The name is often loosely applied to mixtures of zaffer proper with silica, or oxides of iron, manganese, etc..

Psilomelane :: Psilomelane (n.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color..

Wadd :: Wadd (n.) An earthy oxide of manganese, or mixture of different oxides and water, with some oxide of iron, and often silica, alumina, lime, or baryta; black ocher. There are several varieties..

Tephroite :: Tephroite (n.) A silicate of manganese of an ash-gray color.

Weldon''s Process :: Weldon's process () A process for the recovery or regeneration of manganese dioxide in the manufacture of chlorine, by means of milk of lime and the oxygen of the air; -- so called after the inventor..

Bead :: Bead (n.) A glassy drop of molten flux, as borax or microcosmic salt, used as a solvent and color test for several mineral earths and oxides, as of iron, manganese, etc., before the blowpipe; as, the borax bead; the iron bead, etc..

Metal :: Metal (n.) An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than acid properties, as contrasted with the nonmetals, or metalloids. No sharp line can be drawn between the metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bismuth, etc..

Columbite :: Columbite (n.) A mineral of a black color, submetallic 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..

Manganiferous :: Manganiferous (a.) Containing manganese.

Manganite :: Manganite (n.) One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive..

Epidote :: Epidote (n.) A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese..

Hauerite :: Hauerite (n.) Native sulphide of manganese a reddish brown or brownish black mineral.

Manganium :: Manganium (n.) Manganese.

Dendrite :: Dendrite (n.) A stone or mineral on or in which are branching 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..

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