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Formula: K2Ca2(Zn3Si12)O30
Cyclosilicate (ring silicate), osumilite group,
zinc-bearing mineral
Crystal system: Hexagonal
Specific gravity: 2.89 measuured, 2.90 calculated
Hardness: 5½ to 6
Streak: White
Colour: Colourless, white
Luminescence: Bright red fluorescence under short wave UV
Solubility: Insoluble in water and 1:1 hydrochloric acid
Environments
Although shibkovite was approved in 1997, to date (August 2025) it has been approved only
from the type locality.
Localities
At the type locality, Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, shibkovite occurs
as white to colourless equant grains, up to 0.5 mm in size, in
pegmatites in coarse-grained
microcline-quartz rocks in the
moraine deposits of the glacier. Associated minerals include
reedmergnerite, aegirine,
polylithionite,
sogdianite, albite,
pyrochlore, pectolite,
eudialyte group minerals and
turkestanite
(AM 85.628
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