Gunningite
Gunningite is one of the minerals in the Kieserite group, with the chemical formula (Zn,Mn2+)SO4·H2O. Its name honours Henry Cecil Gunning (1901–1991) of the Geological Survey of Canada and a Professor at the University of British Columbia.[2]
| Gunningite | |
|---|---|
| General | |
| Category | Sulfate minerals |
| Formula (repeating unit) | (Zn,Mn2+)SO4·H2O |
| Strunz classification | 7.CB.05 |
| Dana classification | 29.6.2.5 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/c |
| Identification | |
| Color | White to colorless |
| Cleavage | Indistinct |
| Mohs scale hardness | 2.5 |
| Luster | Vitreous |
| Diaphaneity | Translucent |
| Specific gravity | 3.195 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.570 nβ = 1.576 nγ = 1.630 |
| References | [1][2][3] |
Occurrence
Gunningite is rare. It is found in dry areas of the oxidized portions of sphalerite-bearing deposits. It has been noted in mines in Canada (Yukon Territory, British Columbia and New Brunswick), the United States (Nevada and Arizona), Switzerland (Valais), Greece, Attica and Germany (Baden-Württemberg).
See also
References
- http://rruff.geo.arizona.edu/doclib/hom/gunningite.pdf Handbook of Mineralogy
- http://www.mindat.org/min-1778.html Mindat
- http://www.webmineral.com/data/Gunningite.shtml Webmineral data
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