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Formula: CsLi2(Ti,Fe3+)Si4O10(F,OH,O)2
Valence: CsLi2(Ti3+,Fe3+)Si4O10(F,OH,O)2
Phyllosilicate (sheet silicate), trioctahedral mica group,
cesium-, lithium- and
titanium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.28 measured, 3.302 calculated
Hardness: 2½
Streak: White
Colour: Colourless, white
Luminescence: Fluoresces pale yellow under short wave UV
Environments
Gorbunovite is a relatively new mineral, approved in 2017 and to date (December 2025) reported only from the
type locality.
Localities
At the type locality, the Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, gorbunovite
occurs as lamellar grains or flakes from 2 μm to 0.2 mm in a
quartz–pectolite aggregate and is
associated with quartz, fluorite,
pectolite, baratovite,
aegirine, leucosphenite,
neptunite, reedmergnerite,
orlovite, sokolovaite,
mendeleevite-(Ce),
odigitriaite, pekovite,
zeravshanite, kirchhoffite
and garmite
(MM 89.5.694-699).
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