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Formula: Na2Zr(Si6O15)(H2O)3
Inosilicate (chain silicate) of sodium and zirconium, single and
multiple chains, monoclinic
paramorph of orthorhombic
elpidite
Crystal System: Monoclinic
Specific gravity: 2.69 measured, 2.713 calculated
Hardness: 5
Streak: White
Colour: Colourless
Luminescence: No fluorescence under UV
Environments
Yusupovite is a relatively new mineral, approved in 2014 and to date (September 2026) reported only from
the type locality.
Localities
At the type locality, Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, yusupovite was
found in a pegmatite composed mainly of
reedmergnerite, aegirine,
microcline and
polylithionite. It occurs as prismatic grains about 2 mm in size
embedded in reedmergnerite; associated minerals include
quartz, pectolite,
zeravshanite,
mendeleevite-(Ce),
fluorite, leucosphenite, a
pyrochlore group mineral,
neptunite,
telyushenkoite,
moskvinite-(Y) and
shibkovite. Yusupovite is colourless, transparent with a white
streak and vitreous lustre
(AM 100.7.1502-1508).
Yusupovite from Dara-i-Pioz Massif -
Image
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