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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]


1. ^ http://webmineral.com/data/Geigerite.shtml Webmineral data
2. ^ http://www.mindat.org/min-1669.html Mindat
3. ^ http://rruff.geo.arizona.edu/doclib/hom/geigerite.pdf Mineral Handbook

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