General Information
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 Chemical Formula: |
K(K,Na,[ ])(Mn++,Y,Zr)2(Zn,Li)3Si12O30 |
| Composition: |
Molecular Weight = 1,176.31 gm) |
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| 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. |
| Synonym: |
IMA94.010 |
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Classification
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| Dana Class: |
63.2.1a.11 (63)Cyclosilicate Condensed Rings |
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(63.2)Milarite - Osumilite type (6x2) |
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(63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup) |
| Strunz Class: |
VIII/E.22-135 VIII - Silicates |
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VIII/E - Cyklosilicates, double six rings [Si12O30]12- |
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VIII/E.22 - Millarite - Osumilite series |
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Crystallography
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| Axial Ratios: |
a:c = 1:1.3987 |
| Cell Dimensions: |
a = 10.218, c = 14.292, Z = 2; V = 1,292.28 Den(Calc)= 3.02 |
| Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P6/mcc |
| X Ray Diffraction: |
By Intensity(I/Io): 3.25(1) 2.548(0.52) 3.75(0.5) 4.15(0.45) |
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Physical Properties
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| 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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Optical Properties
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| Dichroism (e): |
light blue. |
| Dichroism (w): |
light violet. |
| Optical Data: |
Uniaxial (-), e=1.586, w=1.59, bire=0.0040. |
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Other Information
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| References: |
NAME( MinRec, Vol 28, No 3) PHYS. PROP.(Am.Min.,Vol.82,p430,1997) OPTIC PROP.(MinRec, Vol 28, No 3) |
| See Also: |
Links to other databases for Dusmatovite :
1 -Athena Mineralogy
2 -MinDat.org Location Data
3 -MinMax
4 -WWW-MINCRYST
Search for Dusmatovite using:
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[LYCOS]
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[MAMMA]
[MSN.COM]
[NORTHERN LIGHT]
[YAHOO]
Visit our Advertisers for Dusmatovite :
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Ask about Dusmatovite here :
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Rockhounds Discussion Group on Yahoo Groups
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