Rinkite-(Y)

rinkite-(Y)

turkestanite

kupletskite

neptunite

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Formula: Na₂Ca₄YTi(Si₂O₇)₂OF₃
Sorosilicate (Si₂O₇ groups), rinkite group of the seidozerite supergroup, closely related to mosandrite-(Ce), yttrium- and titanium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.44 measured, 3.475 calculated
Hardness: 5
Streak: White
Colour: Colourless, white
Luminescence: No fluorescence under UV or cathode rays
Environments

Hydrothermal environments

Localities

At the type locality, the Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, rinkite-(Y) is of hydrothermal origin. It occurs as aggregates up to 1.5 cm long of acicular crystals 0.1 to 1.0 mm thick, and as separate elongated columnar, flattened-prismatic crystals up to 1 cm long with rectangular or rhombic sections up to 0.5 mm across. Associated minerals are quartz, aegirine, microcline, neptunite, pectolite, calcite, eudialyte-group minerals, fluorite, titanite, turkestanite, kupletskite, galena, albite and pyrochlore-group minerals. Crystals are transparent and colourless to occasionally white, with a vitreous lustre (MM 83.373-380).

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