Corynite (Antimonian Gersdorffite)
Image: <a href="//commons.wikimedia.org/wiki/User:Archaeodontosaurus" title="User:Archaeodontosaurus">Didier Descouens</a> (CC BY-SA 3.0)
Mineral NameCorynite (Antimonian Gersdorffite)
Chemical FormulaNi(As,Sb)S
Mohs Hardness5.5
Crystal Systemcubic
Lustermetallic
Streak Colorgrayish-black
Cleavagedistinct on {100}
Fractureuneven to conchoidal
Specific Gravity5.6
Colorssilvery-gray, steel-gray, dark-gray
Transparencyopaque
Type LocalityGreinig adit, Gaisberg, Olsa, Friesach, Friesach - Hüttenberg area, Carinthia, Austria
Mineral GroupSulfides
Usescollector, minor ore of nickel
Associated Mineralsquartz, calcite
Rarityuncommon
Description
The image displays a specimen featuring numerous small, silvery-dark gray metallic crystals of Corynite, forming a granular aggregate embedded within a white, likely quartz or calcite, matrix.
Geological Context
Corynite, like its parent mineral Gersdorffite, typically forms in hydrothermal veins, often found in metamorphic or igneous rocks associated with other nickel and arsenic-bearing minerals.
