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Moskvinite-(Y)

Big Photo

Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
© J.Ralph

Formula:
Na
 
2
K(Y,REE) [Si
 
6
O
 
15
]
System:OrthorhombicColour:Colourless, White
Hardness:5
This page provides mineralogical data about Moskvinite-(Y).

Classification of Moskvinite-(Y)

IMA status:Approved 2002
Nickel-Strunz 10th (pending) edition ID:9.CD.05

9 : SILICATES (Germanates)
C : Cyclosilicates
D : [Si3O9]6- 3-membered double rings
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Type Occurrence of Moskvinite-(Y)

Type Locality:Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
Geological Setting of type material:Occurs in a coarse-grained reedmergnerite pegmatite
Associated Minerals at type locality:
TelyushenkoiteShibkoviteShibkovitePolylithioniteMicrocline
LeucophaniteKentbrooksiteHyalotekiteAlbite

Physical Properties of Moskvinite-(Y)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless, White
Hardness (Mohs):5
Hardness (Vickers):VHN100=523
Hardness Data:Measured
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (measured):2.91 g/cm3
Density (calculated):2.92 g/cm3

Crystallography of Moskvinite-(Y)

Crystal System:Orthorhombic
Cell Parameters:a = 10.623Å, b = 14.97Å, c = 8.552Å
Ratio:a:b:c = 0.71 : 1 : 0.571
Unit Cell Volume:V 1338.3 ų
Z:4
Morphology:Isometric grains to 2 mm
X-Ray Powder Diffraction:
d-spacingIntensity
5.32(35)
4.98(100)
3.45(50)
3.26(85)
3.05(75)
2.753(42)
Comments:[d in .ANG.,(I/IO)(hkl)]

Optical Data of Moskvinite-(Y)

Type:Biaxial (+)
RI values: nα = 1.555 nβ = 1.558 nγ = 1.566
2V:Measured: 64° , Calculated: 63°
Maximum Birefringence:δ = 0.011

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Moskvinite-(Y)

Formula:
Na
 
2
K(Y,REE) [Si
 
6
O
 
15
]
All elements listed in formula:K, Na, O, Si, Y

Other Names for Moskvinite-(Y)

Synonyms:
IMA2002-031
Other Languages:
Russian:Москвинит-(Y)

Other Information

IR Spectrum:Band frequencies of the IR spectrum are: 413, 486, 504, 563, 629, 682, 765, 817, 937, 976, 1015, 1041, 1055, 1070, 1109 cm-1.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Moskvinite-(Y)

Reference List:Agakhanov, A.., Pautov, L.A., Sokolova, E.V., Hawthorne, F.S., ad Karpenko, V. Yu. (2003) Moskvinite-(Y), Na2K(Y,REE)[Si6O15], a new mineral. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).

Internet Links for Moskvinite-(Y)

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    Localities for Moskvinite-(Y)

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 15th Nov 2009 09:34:37