Vinogradovite

vinogradovite

lorenzenite

catapleiite

labuntsovite

Images

Formula: Na4Ti4(Si2O6)2[(Si,Al)4O10]O4.(H2O,Na,K)3
Inosilicate (chain silicate), single chains, titanium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.85 to 2.97 measured 2.88 calculated
Hardness: 4
Streak: White
Colour: Colourless, white, pink, pink-brown
Luminescence: Fluoresces white to green under UV
Common impurities: Fe,Nb,Mg,Ca,Ba
Environments

Pegmatites
Hydrothermal environments

Localities

At the type locality, Lepkhe-Nel'm Mt, Seidozero Lake, Lovozersky District, Murmansk Oblast, Russia, vinogradovite occurs in spherulites and in aggregates of fibrous crystals, less commonly in cavities as fine prismatic crystals; it is found at 12 localities as a late-stage hydrothermal mineral in nepheline syenite pegmatites of the Khibina and Lovozero massifs, Kola Peninsula, in cavities of natrolite or analcime in the central part, or replacing lorenzenite and lamprophyllite in the contact zone. Associated minerals include lorenzenite, lamprophyllite, catapleiite, neptunite, labuntsovite, titanite and calcite (AM 42.308, HOM).
Vinogradovite from Lepkhe-Nel'm Mt - IMage

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