Manganese dioxide
Manganese Man`ga*nese", n. [F. mangan[`e]se, It. manganese, sasso magnesio; prob. corrupted from L. magnes, because of its resemblance to the magnet. See {Magnet}, and cf. {Magnesia}.] (Chem.) An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty (melting point 1244[deg] 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]. [1913 Webster +PJC]

Note: An alloy of manganese with iron (called ferromanganese) is used to increase the density and hardness of steel. [1913 Webster]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Manganese dioxide — Manganese dioxide …   Wikipedia

  • manganese dioxide — n. a blackish, crystalline or powdery substance, MnO2, that is a strong oxidizing agent, used in making batteries, matches, etc. * * * …   Universalium

  • manganese dioxide — n. a blackish, crystalline or powdery substance, MnO2, that is a strong oxidizing agent, used in making batteries, matches, etc …   English World dictionary

  • manganese dioxide — mangano(IV) oksidas statusas T sritis chemija formulė MnO₂ atitikmenys: angl. manganese black; manganese dioxide; manganese(IV) oxide rus. марганца диоксид; марганца(IV) оксид; марганцевая черная ryšiai: sinonimas – mangano dioksidas sinonimas –… …   Chemijos terminų aiškinamasis žodynas

  • manganese dioxide — noun : a dark brown or gray black insoluble compound MnO2 found in nature as pyrolusite, made synthetically (as by decomposition of manganous nitrate or by chemical or electrolytic precipitation), and used chiefly as an oxidizing agent and a… …   Useful english dictionary

  • manganese dioxide — /mæŋgəˌniz daɪˈɒksaɪd/ (say mangguh.neez duy oksuyd) noun a heavy black powder, MnO2, occurring naturally as pyrolusite; used as a source of metallic manganese, as an oxidising agent, and as a catalyst. Also, manganese peroxide …   Australian English dictionary

  • manganese dioxide — noun Date: 1866 a dark insoluble compound MnO2 used especially as an oxidizing agent, as a depolarizer of dry cells, and in making glass and ceramics …   New Collegiate Dictionary

  • Manganese(II) sulfate — monohydrate Mangan …   Wikipedia

  • Manganese(II) carbonate — IUPAC name Manganese(II) carbonate …   Wikipedia

  • Manganese(II) chloride — Anhydrous Tetrahydrate …   Wikipedia

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