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Geigerite : ウィキペディア英語版
Geigerite


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.〔http://webmineral.com/data/Geigerite.shtml Webmineral data〕〔http://www.mindat.org/min-1669.html Mindat〕
It was discovered in Grischun, Switzerland in 1989. It was named
in honor of Thomas Geiger (1886–1976), Wiesendangen, Switzerland, who studied the Falotta manganese ores.〔http://rruff.geo.arizona.edu/doclib/hom/geigerite.pdf Mineral Handbook〕
==Composition==

The chemical composition of geigerite is hydrous manganese arsenate or Mn5 (AsO4)2(AsO3OH)2
*10H20 (Graeser, S. 1989). The chemical composition was found by using an electron microprobe in the Falotta mines in Switzerland (Graeser, S. 1989).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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