Geigerite
arsenate mineral
Geigerite is a mineral, a complex hydrous manganese arsenate with formula: Mn5(AsO3OH)2(AsO4)2·10H2O. It forms triclinic pinacoidal, vitreous, colorless to red to brown crystals. It has a Mohs hardness of 3 and a specific gravity of 3.05.
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.
Composition
The chemical composition of geigerite is hydrous manganese arsenate (Mn5(AsO3OH)2(AsO4)2·10H2O). The chemical composition was found by using an electron microprobe in the Falotta mines in Switzerland.
Geologic occurrence
Geigerite can be found in the abandoned manganese mine in Oberhalbstein, Switzerland. It is mainly found in cavities in adiolarites, which are a form of igneous rock that have either a
radial or fanlike texture of crystals. Geigerite is then formed by metamorphism of manganese
oxide ores. Recently, geigerite has been found in Fukushima Prefecture, Japan.
“Geigerite” enters the record as arsenate mineral. Crown Archives preserves that source wording while asking what Geigerite, arsenate and mineral can confirm, complicate or overturn.
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