Brownish black inclusions of the extremely rare Hg-Br mineral kelyanite from the type locality in Kelyana Hg deposit (Kelyana Hg deposit, Middle Kelyana River, Baunt District, Buryatia, Russian Federation) included in a polished probe amount that was used to analyse it. Analyzed by the former owner of the specimen, the Vandenbroucke Museum collection, from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Kelyanite
Kelyanite is an IMA-recognized mineral species in the halide class, with the chemical formula Hg₁₂SbO₆BrCl₂.
It crystallizes in the hexagonal crystal system (space group P3).
Key properties: Mohs hardness 3–3.5; specific gravity 8.51–8.63; Resinous to vitreous streak.
IMA symbol Kyn, IMA status: approved, named in 1981.
Found in the oxidation zone of a stibnite-cinnabar ore deposit.
It is found associated with Calomel, eglestonite, mercury, shakhovite, antimony oxides.
The name refers to the Kelyana mine, Russia, where it was first found.