manganese

American  

[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. Mn; 54.938; 25; 7.2 at 20°C.

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manganese British  

/ 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

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manganese Scientific  

/ măng′gə-nēz′ /

1. 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.

2. See Periodic Table

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Etymology

Origin of manganese

1670–80; < French manganèse < Italian manganese, alteration of Medieval Latin magnesia magnesia

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Example Sentences

See Examples For:

manganese

Between 2012 and 2023, official gold production nearly quadrupled from 13 to 51 tonnes, while the country also boasts veins of iron, diamonds, nickel, manganese, bauxite, copper and coltan.

From Barron's ● Sep. 30, 2026

More than 70 percent of its population of 22 million lives on less than $3 a day, according to the World Bank, despite the country also having significant potential in cobalt, nickel and manganese.

From Barron's ● Aug. 16, 2026

This second layer is based on manganese and begins forming at about ~720 mV.

From Science Daily ● Aug. 11, 2026

Researchers had long believed that many black paintings in the region were made entirely from iron and manganese oxides.

From Science Daily ● Jul. 28, 2026

Still other soil microbes perform various oxidations and reductions by which minerals such as iron, manganese, and sulfur are transformed and made available to plants.

From "Silent Spring" by Rachel Carson

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