Grechishchevite
Grechishchevite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Hg₃S₂BrCl₀.₅I₀.₅.
It crystallizes in the orthorhombic crystal system (space group Pbnm).
Key properties: Mohs hardness 2.5; specific gravity 7.23; Deep yellow to yellow with slight orange tint streak; Vitreous to adamantine luster; optically uniaxial.
IMA symbol Gcv, IMA status: approved, named in 1988.
Found in hydrothermal mercury deposits.
It is found associated with Cinnabar, calomel, kuzminite, corderoite, kadyrelite, lavrentievite, eglestonite.
The mineral was named to honor Oleg Konstantinovich Grechishchev (1936–), Institute of Geology, Novosibirsk, Russia, a student of the Tuva mercury deposits.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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