General Information:
Chemical Formula:
K(K,Na,[ ])(Mn++,Y,Zr)2(Zn,Li)3Si12O30
Composition:
(Molecular Weight = 1,176.31 gm)
Potassium 5.32 % K
Sodium 0.59 % Na
Lithium 0.44 % Li
Yttrium 4.53 % Y
Zirconium 1.55 % Zr
Manganese 5.60 % Mn
Zinc 12.51 % Zn
Silicon 28.65 % Si
Oxygen 40.80 % O
Empirical Formula:
K1.6Na0.3Mn3+1.2Y0.6Zr0.2Zn2.25Li0.75Si12O30
Environment:
In a pegmatite boulder in a glacial moraine.
IMA Status:
Approved IMA
Locality:
The Dara-i-Pioz alkaline massif, Tien Shan, Tajikistan.
Name Origin:
For Vyacheslav Djuraevitch Dusmatov (1936-), Mineralogist and geologist who has done much work at the locality.
Physical Properties:
Cleavage:
None
Color:
blue, dirty blue, or violet brown.
Density:
2.96
Diaphaniety:
Translucent
Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
Hardness:
4.5 - Between Fluorite and Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
pale blue
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