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Mineralpedia Details for Belyankinite

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Belyankinite

Belyankinite

Dmitry Stepanovich Belyankin is the namesake of Belyankinite as a formerly prominent mineralogist ant petrographer. The type and only locality for Belankinite is at the Medvzh’ya Berloga pegmatite in the Lovozero Massif in the Kola Peninsula in Russia. There, it occurs as inclusions “in aegirine and microcline, in nepheline syenite pegmatite in an alkalic massif, in part probably as a replacement of murmanite.” Other associated minerals include zeolites, eudialyte, lorenzenite, lamprophyllite, and titanium oxides.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/belyankinite.pdf

Formula
Ca1-2(Ti,Zr,Nb5O12*9(H2O) (?) 
Crystal System
No Crystals 
Crystal Habit
Platy, Aggregates 
Cleavage
Perfect 
Luster
Vitreous - Greasy 
Color
yellow, brownish yellow 
Class
Amorphous - No Crystals 
Fracture
Brittle - Uneven 
Hardness
2-3 
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Belyankinite from Pegmatite #13, Tyul'bnyunuai River Valley, Lovozero Massif, Kola Peninsula, Russia

Belyankinite
            from Pegmatite #13, Tyul'bnyunuai River Valley, Lovozero Massif, Kola Peninsula, Russia

Pinkish to light tan platy crystals which are pseudomorphous after Murmanite with an Aegerine matrix. This is the best known locality of Belyankinite in the world.

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Belyankinite from Medvzh'ya Berloga pegmatite, Tyulbnyunuai River valley, Lovozero Massif, Kola Peninsula, Russia

Belyankinite
            from Medvzh'ya Berloga pegmatite, Tyulbnyunuai River valley, Lovozero Massif, Kola Peninsula, Russia

Cream colored crystals which as replacement after Murmanite. Belyankinite is found in the block zone of the pegmatite and represents the richest deposit in Lovozero.

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Belyankinite from Flora Mt., Lovozero Massif, Kola Peninsula, Russia

Belyankinite
            from Flora Mt., Lovozero Massif, Kola Peninsula, Russia

Tannish brown thick platy crystals occupying most of matrix.

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