Outstanding white acicular crystals of the extremely rare magnesium chloride mineral korshunovskite from the type locality (Korshunovskoje, Siberia, Russian Federation) and only one of the three known localities worldwide. — Photo: David Hospital · CC BY-SA 4.0
Korshunovskite
Korshunovskite is an IMA-recognized mineral species in the halide class, with the chemical formula Mg₂Cl(OH)₃·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2; specific gravity 1.798.
IMA symbol Kss, IMA status: approved, named in 1980.
From a drill core taken at 770 m in an iron ore deposit, in low-temperature hydrothermal veinlets in dolomitic marble.
It is found associated with Ekaterinite, shabynite, magnetite, antigorite, dolomite, magnesite.
The name refers to the Korshunov deposit, Russia, where it was first discovered. Type Material: A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.