Garmite

garmite

kalyuzhnyite-(Ce)

pectolite

lithium

Images

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

Pegmatites

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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