One small specimen of the extremely rare Cu-Fe-Sn sulphide mineral chatkalite from the type locality in Kockbulak Mine (Kockbulak Mine, Okhangaron District, Tashkent Viloyati, Uzbekistan). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Chatkalite
A tetragonal copper-iron-tin sulfide occurring as rounded inclusions inside tetrahedrite in quartz veins.
Intro adapted from Wikipedia (CC BY-SA).
Chatkalite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu₆FeSn₂S₈.
It crystallizes in the tetragonal crystal system (space group P-4m2).
Key properties: specific gravity 5.
IMA symbol Ctk, IMA status: approved, named in 1981.
Occurs as rounded disseminations in tetrahedrite, from a sulfide-bearing quartz vein (Kochbulak deposit, Uzbekistan).
It is found associated with Cassiterite, hemusite, hessite, tetrahedrite (Kochbulak deposit, Uzbekistan); pyrite, sphalerite, marcasite, galena, chalcopyrite, stannite.
The name refers to the occurrence in the Chatkal-Kuramin Mountains, Russia.