Kupletskite-(Cs)

kupletskite-(Cs)

tienshanite

sogdianite

thorite

Images

Formula: Cs₂NaMn²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Inosilicate (chain silicate), single chains, kupletskite group, astrophyllite supergroup, forms a series with kupletskite, cesium-, manganese- and titanium- bearing mineral
Crystal system: Triclinic
Specific gravity: 3.68 measured, 3.609 calculated
Hardness: 4
Colour: Golden brown
Environments

Pegmatites

Localities

At the type locality, the Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, kupletskite-(Cs) occurs in rosette-like intergrowths of curved platy crystals at the border of aegirine - microcline - quartz pegmatites and in polylithionite-quartz replacement complexes in the pegmatites. Associated minerals include pyrochlore, stillwellite-(Ce), tienshanite, sogdianite and thorite (AM 57.328).
Kupletskite-(Cs) from the Dara-i-Pioz Massif - Image

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