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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
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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