Images
Formula: Ba4Y2Si8B4O28F
Cyclosilicate (ring silicate), hyalotekite group,
barium-, yttrium- and
boron- bearing mineral
Crystal system: Triclinic
Specific gravity: 3.74 measured, 3.79 calculated
Hardness: 5½
Streak: White
Colour: Pale pink
Luminescence: Pale-pink luminescence under short wave UV
Environments
Kapitsaite-(Y) was approved in 1998, but to date (April 2025) it has been reported only from the type locality.
Localities
At the type locality, the Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan,
kapitsaite-(Y) occurs as a pale pink, sheaf-like aggregate, 1 × 3 cm in size. It is associated with
quartz, reedmergnerite,
leucosphenite,
polylithionite, pectolite,
pyrochlore, turkestanite
and aegirine in a boulder of peralkaline
pegmatite in the moraine of the Dari-i-Pioz glacier
(AM 86.1535).
Kapitsaite-(y) from the Dara-i-Pioz Massif -
Image
Back to Minerals