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Geigerite
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<p>Geigerite is a mineral, a complex hydrous <a href="/facts/Manganese/j9ELd1TL">manganese</a> <a href="/facts/Arsenate/IWco5TAH">arsenate</a> with formula: Mn5(AsO3OH)2(AsO4)2·10H2O. It forms <a href="/facts/Triclinic/Y6yEdqfN">triclinic</a> pinacoidal, vitreous, colorless to red to brown crystals. It has a <a href="/facts/Mohs_hardness/wXBMcVIm">Mohs hardness</a> of 3 and a <a href="/facts/Specific_gravity/ySquGd2x">specific gravity</a> of 3.05. </p><p>It was discovered in <a href="/facts/Grischun/MngHSID3">Grischun</a>, <a href="/facts/Switzerland/LcGuxeTe">Switzerland</a> in 1989. It was named in honor of Thomas Geiger (1886–1976), Wiesendangen, Switzerland, who studied the Falotta manganese ores. </p>