Tisinalite

tisinalite

koashvite

shcherbakovite

lamprophyllite

Images

Formula: Na₃Mn²⁺TiSi₆O₁₅(OH)₃
Cyclosilicate (ring silicate), zirsinalite-lovozerite subgroup, lovozerite group, manganese- and titanium- bearing mineral
Crystal System: Trigonal
Specific gravity: 2.66 to 2.69 measured, 2.682 calculated
Hardness: 5
Colour: Yellow-orange
Common impurities: K
Environments

Pegmatites
Hydrothermal environments

Localities

At the type locality, the Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia, tisinalite occurs in rough crystals up to 1 x 0.5 X 0.5 mm³ and granular aggregates up to 1 cm wide in drill cores that cut alkalic pegmatites. It is formed by the hydrothermal alteration of lomonosovite and barium-lamprophyllite; associated minerals include koashvite, shcherbakovite and lamprophyllite - (AM 66.217-220).

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