Babkinite
Babkinite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₂Bi₂(S,Se)₃.
It crystallizes in the hexagonal crystal system. It is a member of the Tetradymite structural group.
Key properties: Mohs hardness 2; specific gravity 8.096; Gray streak; Metallic luster; optically uniaxial.
IMA symbol Bbk, IMA status: approved, named in 1994.
Found in a hydrothermal deposit in sediments, near their contact with a granite intrusion.
It is found associated with Arsenopyrite, stannite, tetrahedrite, wittite, laitakarite, selenian cosalite, cassiterite, wolframite.
The mineral was named to honor Petr Vasil’evich Babkin (1929–1977), Russian geologist, Northeast Geological Administration of Mingeo, Magadan, Russia, who first studied the Nevskoye deposit.