Belyankinite

belyankinite

aegirine

microcline

manganbelyankinite

Images

Formula: Ca1-2(Ti,Zr,Nb)5O12.9H2O (?)
Oxide, titanium-, zirconium- and niobium- bearing mineral, forms a series with manganbelyankinite
Questionable species
Crystal System: Orthorhombic or monoclinic
Specific gravity: 2.32 to 2.4 measured
Hardness: 2 to 3
Colour: White, light yellow to brownish yellow; black when manganese-rich
Solubility: decomposed completely by hot hydrochloric acid
Environments

Pegmatites

Localities

At the type locality, the Medvezh'ya Berloga pegmatite, Tyulbnyunuai River Valley, Lovozersky District, Murmansk Oblast, Russia, belyankinite occurs in nepheline syenite pegmatite composed mainly of microcline, nepheline and aegirine, with the nepheline replaced in part by zeolites. Belyankinite occurs in aegirine and sometimes in microcline; it was formed simultaneously with fluorite, but prior to aegirine. The outer parts of the pegmatite contain eudialyte, lorenzenite and lamphrophyllite (AM 37.882).

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