- a hard, brittle, grayish-white, metallic element, an oxide of which, MnO2 (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.
Origin of manganese
Examples from the Web for manganese
The fact that the Rio Grande rise also harbors traces of iron and manganese was not lost on the minerals industry.Atlantis Discovered?
May 10, 2013
Some metals are non-magnetic, this applying to iron if combined with manganese.Electricity for Boys
J. S. Zerbe
The heat throws off the oxygen from the red lead or manganese.Handwork in Wood
As has been stated previously, manganese forms two series of salts.An Elementary Study of Chemistry
The manganese ores are mined principally in the oxidized zone.The Economic Aspect of Geology
C. K. Leith
It is an advantage to add granulated carbon to the manganese.
- 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
Word Origin and History for manganese
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.
- A brittle metallic element, having several allotropes. It is alloyed with steel to increase strength. Atomic number 25.
- 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.