Geigerite
A variety of Minerals
What is Geigerite?
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.
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Key Characteristics
Composition of Geigerite
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.
Quick Facts
Physical Properties
- Hardness (Mohs)
- 3
Chemical Properties
- Chemical Formula
- Mn2+5(AsO4)2(HAsO4)2 · 10H2O
- Elements
- As, H, Mn, O
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