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Mineralpedia Details for Golyshevite

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Golyshevite

Golyshevite

Named for Russian crystallographer Vladimir Mikhailovich Golyshev of the Mordvinian State University in Saransk, Russia. It occurs only at the type locality in the calcium-rich peralkaline Kovdor Phlogopite mine in the Kovdor massif in the Kola Peninsula, Russia. It is associated with cancrinite, aegirine-augite, hedenbergite, orthoclase, pectolite, thomsonite-Ca, tacharanite, and calcite. Appears as reddish-brown grains, and rarely as crystals.

Ref. Chukanov, N.V. et al. and Zapiski Vserossijskogo Mineralogičeskogo Obŝestva 2005, Vol. 134, No. 6, 36-47

Formula
Na10Ca9Zr3Fe2SiNb(Si3O9)2(Si9O27)2(OH)3(CO3)·H2
Crystal System
Trigonal 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
dark reddish brown 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
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Golyshevite from Iron mine, Kovdor Massif, Kola Peninsula, Russia

Golyshevite
            from Iron mine, Kovdor Massif, Kola Peninsula, Russia

Brown vitreous crystal to 5mm in thomsonite-Ca matrix. 

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Golyshevite from Mica mine, Kovdor Massif, Kola, Russia

Golyshevite
            from Mica mine, Kovdor Massif, Kola, Russia
Special Info
XRD Confirmed, EDS Confirmed, Type & Only Locality, Author's Material

Brown crystals to 2mm in white aggregate of thomsonite-Ca and pectolite with minor dark diopside. Golyshevite is an extremely rare zirconium-niobium mineral found only at this locality. This is a study specimen from the author, Dr. Igor Pekov.

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