Dusmatovite

dusmatovite

tadzhikite-(Y)

kupletskite-(Cs)

hyalotekite

Images

Formula: KK₂Mn₂(Zn₂LiSi₁₂)O₃₀
Cyclosilicate (ring silicate), osumilite group, manganese-, zinc- and lithium- bearing mineral
Crystal system: Hexagonal
Specific gravity: 2.96 measured, 2.978 calculated
Hardness: 4½
Streak: Light blue
Colour: Dark blue, dirty blue, violet-brown
Solubility: Insoluble in hot hydrochloric acid, but readily soluble in warm HF
Common impurities: Li,Y,Mn(III),Zr,Fe
Environments

Pegmatites

Although dusmatovite was approved in 1994, to date (May 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, dusmatovite occurs as aggregates to 40 x 50 mm in size and as single grains; it is dark blue, dirty blue or violet-brown in colour, translucent with a vitreous lustre and a light blue streak. It was found in a boulder of pegmatite in glacial moraine of the Dara-i-Pioz glacier. The boulder consists of quartz and microcline with minor aegirine, tadzhikite-(Ce), kupletskite-(Cs), hyalotekite, betafite and polylithionite (AM 82.430-433).
Dusmatovite from Dara-i-Pioz - Image

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