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Geigerite is a mineral, a complex hydrous manganese arsenate with formula: Mn5(AsO3OH)2(AsO4)2·10H2O. It forms triclinic pinacoidal vitreous colorless, red to brown crystals. It has a Mohs hardness of 3 and a specific gravity of 3.05.[1][2]

It was discovered in Grischun, Switzerland in 1989. It was named in honor of Dr. Thomas Geiger (1886–1976), Wiesendangen, Switzerland, who studied the Falotta manganese ores.[3]

See also


  1. ^ Webmineral data
  2. ^ Mindat
  3. ^ Mineral Handbook
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Geigerite". A list of authors is available in Wikipedia.
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