Manganese

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Manganese ore

Description

A silvery-white, brittle metallic element. Manganese is an abundant, widely distributed element that is present in about 0.1% of the earth's crust. It occurs naturally in the minerals braunite, rhodochrosite, pyrolusite, hausmannite, manganite, manganosite, and in nodules on the ocean floor. Manganese metal was isolated in 1774 by Johann Gahn of Sweden. Pure manganese powder is used as a deoxidizing agent (see Ageless®). Metallic manganese cannot be fabricated, but rather it is used in the form of ferromanganese alloy. Manganese is added to steel and other metals to increase strength, hardness, and wear resistance. Manganese salts are used in glass and ceramic glazes to produce pink tones.

Manganite

Synonyms and Related Terms

Mn; Mangaan (Ned.); manganèse (Fr.); Mangan (Deut.); manganês (Port.); manganeso (Esp.); Mangan (Sven.); braunite; rhodochrosite; pyrolusite; hausmannite; manganite; manganosite

Other Properties

Decomposes slowly in water. Reacts with mineral acids.

Composition Mn (atomic no. 25)
CAS 7439-96-5
Mohs Hardness 5.0
Melting Point 1244
Density 7.47
Molecular Weight atomic wt = 54.9380
Boiling Point 2095

Hazards and Safety

Inhalation or ingestion of manganese can cause a nervous system disorder. Dust and powder are flammable

International Chemical Safety Card

Additional Information

Web Elements: Website

Authority (list of all sources checked form information on this subject)

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5762
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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