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Formula: CsLiMg2(Si4O10)F2
Phyllosilicate (sheet silicate), trioctahedral mica group,
mica group, cesium- and
lithium- bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.34 measured, 3.336 calculated
Hardness: 2½
Streak: White
Colour: Colourless, white in aggregates
Luminescence: Pale yellow fluorescence under short wave UV
Environments
Garmite is a relatively new mineral, approved in 2017.
Localities
At the type locality, Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan,
kalyuzhnyite-(Ce) occurs in a
quartz–pectolite aggregate in a
peralkaline
pegmatite. Associated minerals are
quartz, fluorite,
pectolite, baratovite,
aegirine, leucosphenite,
neptunite, reedmergnerite,
orlovite, sokolovaite,
mendeleevite-(Ce),
odigitriaite, pekovite,
zeravshanite, kirchhoffite
and garmite
(MM 88.1.19–30).
Garmite occurs as lamellae up to 0.2 mm across and up to 0.02 mm thick
(Mindat).
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