Geigerite
Geigerite | ||
---|---|---|
General | ||
Category | 2V angle 89° | |
References | [2][3][4][5] |
Geigerite is a mineral, a complex hydrous
It was discovered in
Composition
The chemical composition of geigerite is hydrous manganese arsenate (Mn5(AsO3OH)2(AsO4)2·10H2O).[4] The chemical composition was found by using an electron microprobe in the Falotta mines in Switzerland.[4]
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.[4] Recently, geigerite has been found in Fukushima Prefecture, Japan.[7] Geigerite has also been found in Mt. Nero Mine, Borghetto Di Vara, La Spieza, Italy.[8]
Structure
Geigerite’s crystal system is
Special characteristics
One interesting structural feature of geigerite is the presence of a complicated network of hydrogen bonds, which exceed the number of the hydrogen atoms.[4] Geigerite is classified under a group of metal copper (II) arsenates called the Lindackerite group. Minerals within this group have a formula where M equals either copper, calcium, manganese, zinc, or cobalt.[9]
See also
References
- S2CID 235729616.
- ^ a b c Geigerite data on Webmineral.com
- ^ a b Geigerite on Mindat.org
- ^ a b c d e f Graeser, S.; Schwander, H.; Bianchi, R.; Pilati, T.; Gramaccioli, C. M. (1989): Geigerite, the manganese analogue of chudobaite: Its description and crystal structure. American Mineralogist: 74, 676–684.
- ^ a b Geigerite in the Handbook of Mineralogy
- ^ Geiger, Thomas (1948). Manganerze in der Radiolariten Graubündens (PDF) (Ph.D.). ETH Zürich.
- ^ Kato et al. (1990) Ganseki-Koubutsu-Koshogaku Zasshi, 85, 184.; Mineralogical Journal Vol. 18 (1996), No. 4 pp 155–160
- ^ Cabella, R. (2000) Geigerite from Mt Nero manganese mine (Northern Apennines, La Spezia, Italy). Neues Jahrbuch fur Mineralogy-Monatshefte, 570–576.
- ^ Hybler, M. (2003) Crystal structure of Lindackerite, (Cu,Co,Ni)CU4(AsO4)(2)(AsO3OH)(2)center dot 9 H2O from Jachymov, Czech republic. European Journal of Mineralogy, 1035–1042.
- Bergknappe (2000) Verein der Freunde des Bergbaus in Graubunden Stiftung Bergbaumuseum Graubunden Schelzboden-Davos. 31–32.