Manganese



[mang-guh-nees, -neez] /ˈmæŋ gəˌnis, -ˌniz/

noun, Chemistry.
1.
a hard, brittle, grayish-white, metallic element, an oxide of which, MnO 2 (manganese dioxide) is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. Symbol: Mn; atomic weight: 54.938; atomic number: 25; specific gravity: 7.2 at 20°C.
/ˈmæŋɡəˌniːz/
noun
1.
a brittle greyish-white metallic element that exists in four allotropic forms, occurring principally in pyrolusite and rhodonite: used in making steel and ferromagnetic alloys. Symbol: Mn; atomic no: 25; atomic wt: 54.93805; valency: 1, 2, 3, 4, 6, or 7; relative density: 7.21–7.44; melting pt: 1246±3°C; boiling pt: 2062°C
n.

1670s as the name of a mineral, oxide of manganese, from French manganèse (16c.), from Italian manganese, alteration or corruption of Medieval Latin magnesia (see magnesia). From 1783 in English as the name of an element.

manganese man·ga·nese (māng’gə-nēz’, -nēs’)
n.
Symbol Mn
A brittle metallic element, having several allotropes. It is alloyed with steel to increase strength. Atomic number 25; atomic weight 54.9380; melting point 1,246°C; boiling point 2,061°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7.
manganese
(māng’gə-nēz’)
Symbol Mn
A grayish-white, hard, brittle metallic element that occurs in several different minerals and in nodules on the ocean floor. It is used to increase the hardness and strength of steel and other important alloys. Atomic number 25; atomic weight 54.9380; melting point 1,244°C; boiling point 1,962°C; specific gravity 7.21 to 7.44; valence 1, 2, 3, 4, 6, 7. See Periodic Table.

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  • Manganese-bronze

    noun 1. an alloy that is about 55 percent copper, 40 percent zinc, and up to 3.5 percent manganese. noun 1. any of various alloys containing copper (55–60 per cent), zinc (35–42 per cent), and manganese (about 3.5 per cent)

  • Manganese nodule

    noun 1. (geology) a small irregular concretion found on deep ocean floors having high concentrations of certain metals, esp manganese



  • Manganese-spar

    noun 1. Mineralogy. rhodonite or rhodochrosite.

  • Manganese-steel

    noun 1. any of various steels containing manganese, especially one that has up to 14 percent manganese, used in work involving heavy strains and impacts. noun 1. any very hard steel containing manganese (11–14 per cent), used in dredger buckets, rock-crushers, railway points, etc



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