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Manganese   /mˈæŋgənˌiz/   Listen
noun
Manganese  n.  (Chem.) An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty (melting point 1244° C), but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic number 25; Atomic weight 54.938 (C=12.011). Note: An alloy of manganese with iron (called ferromanganese) is used to increase the density and hardness of steel.
Black oxide of manganese, Manganese dioxide or Manganese peroxide, or Black manganese (Chem.), a heavy black powder MnO2, occurring native as the mineral pyrolusite, and valuable as a strong oxidizer; called also familiarly manganese. It colors glass violet, and is used as a decolorizer to remove the green tint of impure glass.






Collaborative International Dictionary of English 0.48








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"Manganese" Quotes from Famous Books



... rail itself is of special soft steel, to secure high conductivity. Its composition, as shown by tests, is as follows: Carbon, .08 to .15; silicon, .05; phosphorus, .10; manganese, .50 to .70; and sulphur, .05. Its resistance is not more than eight times the resistance of pure copper of equal cross-section. The section chosen weighs 75 pounds per yard. The length used in general is 60 feet, but in ...
— The New York Subway - Its Construction and Equipment • Anonymous

... articulate, and which would be most trying to a poet's measures. I don't wish to say a word against so respectable a science, far be that from me. True, in the august presence of rhombohedral crystals, retinasphaltic resins, gehlenites, Fassaites, molybdenites, tungstates of manganese, and titanite of zirconium, why, the most facile of tongues may make ...
— A Journey to the Interior of the Earth • Jules Verne

... the sky, and others veiled in trailing storms, and still others white with snow. That night in the dingy little store I heard prospectors talk about float, which meant gold on the surface, and about high grade ores, zinc, copper, silver, lead, manganese, and about how borax was mined thirty years ago, and hauled out of Death Valley by teams of twenty mules. Next morning, while Nielsen packed the outfit, I visited the borax mill. It was the property of an English firm, and the work of hauling, ...
— Tales of lonely trails • Zane Grey

... exhausted. The mineral products of the Tavistock district are various, and besides tin and copper, ores of zinc and iron are largely distributed. Great quantities of refined arsenic have been produced at the Devon Great Consols mine, by elimination from the iron pyrites contained in the various lodes. Manganese occurs in the neighbourhood of Exeter, in the valley of the Teign and in N. Devon; but the most profitable mines, which are shallow, are, like those of tin and ...
— Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 - "Destructors" to "Diameter" • Various

... abundant, and Iron occurs in the form of magnetic iron ore, titanite, chromate, yellow hydrated, per-oxide and iron pyrites. In most of these, however, the metal is scanty, and the ores of little comparative value, except for the extraction of manganese and chrome. "But there is another description of iron ore," says Dr. Gygax, in his official report to the Ceylon Government, "which is found in vast abundance, brown and compact, generally in the state of carbonate, though still blended ...
— Ceylon; an Account of the Island Physical, Historical, and • James Emerson Tennent


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