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Category Sulfate minerals
(repeating unit)
Strunz classification 7.CB.05
Dana classification
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/c
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, British Columbia, Canada.[2]


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[edit]