Gunningite

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)
H-M symbol: (2/m)
Space group Monoclinic
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]

Gunningite is one of the minerals in the Kieserite group. Its chemical formula is (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, Vancouver, Canada.[2]

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

  1. ↑ http://rruff.geo.arizona.edu/doclib/hom/gunningite.pdf Handbook of Mineralogy
  2. 1 2 http://www.mindat.org/min-1778.html Mindat
  3. ↑ http://www.webmineral.com/data/Gunningite.shtml Webmineral data


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