Formula: K(K,Na)Mn2(Zn,Li)3Si12O30
Origin of name: For Vyacheslav Djuraevitch Dusmatov (1936-, Russian mineralogist and geologist who has done much work at the locality
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 10.218, c = 14.292
Colour: Blue, violet-brown
Diaphaneity: Translucent
Luster: Vitreous
Habit: Aggregates to 4 x 5 cm, single grains
Hardness: 4.5
Specific gravity: 2.96
Cleavage: 0; Basal parting
Tenacity: Brittle
Streak: Light blue
Synonyms/varieties:
Comments: Readily soluble in warm HF, insoluble in hot HCl
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