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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..

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..

Manganite :: Manganite (n.) A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.

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

Manganic :: Manganic (a.) Of, pertaining to resembling, or containing, manganese; specif., designating compounds in which manganese has a higher valence as contrasted with manganous compounds. Cf. Manganous..

Umber :: Umber (n.) A brown or reddish pigment used in both oil and water colors, obtained from certain natural clays variously colored by the oxides of iron and manganese. It is commonly heated or burned before being used, and is then called burnt umber; when not heated, it is called raw umber. See Burnt umber, below..

Manganiferous :: Manganiferous (a.) Containing manganese.

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

Babingtonite :: Babingtonite (n.) A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime..

Pyrosmalite :: Pyrosmalite (n.) A mineral, usually of a pale brown or of a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe..

Polianite :: Polianite (n.) Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz..

Braunite :: Braunite (n.) A native oxide of manganese, of dark brownish black color. It was named from a Mr. Braun of Gotha..

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

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

Lithiophilite :: Lithiophilite (n.) A phosphate of manganese and lithium; a variety of triphylite.

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..

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..

Manganesium :: Manganesium (n.) Manganese.

Wolframite :: Wolframite (n.) Tungstate of iron and manganese, generally of a brownish or grayish black color, submetallic luster, and high specific gravity. It occurs in cleavable masses, and also crystallized. Called also wolfram..

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