Manganese

man·ga·nese   (māng'gə-nēz', -nēs')    n.   Symbol Mn A gray-white or silvery brittle metallic element, occurring in several allotropic forms, found worldwide, especially in the ores pyrolusite and rhodochrosite and in nodules on the ocean floor. It is alloyed with steel to increase strength, hardness, wear resistance, and other properties and with other metals to form highly ferromagnetic materials. 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 Table at element. [French manganèse, from Italian manganese, from Medieval Latin magnēsia, mineral ingredient of the philosophers' stone; see magnesia.] man'ga·ne'sian (-nē'zhən, -shən) adj.

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, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.

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 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.

Manganese bronze, an alloy made by adding from one to two per cent of manganese to the copper and zinc used in brass.

manganese 

Main Entry: man·ga·nese
Pronunciation: 'ma[ng]-g&-"nEz, -"nEs
Function: noun
: a grayish white usually hard and brittle metallic elementthat resembles iron but is not magnetic —symbol Mn; —see ELEMENT table

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')  Pronunciation Key  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.