Moskvinite-(Y)
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Moskvinite-(Y)
Formula:
Na2KYSi6O15
Y may be replaced by minor REE.
Colour:
Colourless, White
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.91
Crystal System:
Orthorhombic
Name:
Named by A.A. Agakhanov, L.A. Pautov, E.V. Sokolova, F.C. Hawthorne, and V.Y. Karpenko in 2003 in honor of Alexander Veniaminovic Moskvin (Александр Вениаминович Москвин) (1897 – 2 March 1974, Leningrad, Russia), Russian geologist and member of the Tajik-Pamirs expedition (1932–1936). He was first to identify the Dara-i-Pioz alkaline massif.
This page provides mineralogical data about Moskvinite-(Y).
Unique Identifiers
Mindat ID:
27552
Long-form identifier:
mindat:1:1:27552:1
IMA Classification of Moskvinite-(Y)
Approved
Approval year:
2002
First published:
2003
Classification of Moskvinite-(Y)
9.CD.05
9 : SILICATES (Germanates)
C : Cyclosilicates
D : [Si3O9]6- 3-membered double rings
9 : SILICATES (Germanates)
C : Cyclosilicates
D : [Si3O9]6- 3-membered double rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mskv-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Moskvinite-(Y)
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Moskvinite-(Y)
Vitreous
Transparency:
Transparent
Colour:
Colourless, White
Streak:
White
Hardness:
5 on Mohs scale
Hardness:
VHN100=523 - Vickers
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.91(1) g/cm3 (Measured) 2.92 g/cm3 (Calculated)
Optical Data of Moskvinite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.555 nβ = 1.558 nγ = 1.566
2V:
Measured: 64° , Calculated: 63°
Max. Birefringence:
δ = 0.011
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Low (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Chemistry of Moskvinite-(Y)
Mindat Formula:
Na2KYSi6O15
Y may be replaced by minor REE.
Y may be replaced by minor REE.
Element Weights:
Crystallography of Moskvinite-(Y)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 10.623(2) Å, b = 14.970(2) Å, c = 8.552(2) Å
Ratio:
a:b:c = 0.71 : 1 : 0.571
Unit Cell V:
1338.3 ų
Z:
4
Morphology:
Isometric grains to 2 mm
Comment:
Space Group: Ibmm.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005835 | Moskvinite-(Y) | Sokolova E V, Hawthorne F C, Agakhanov A A, Pautov L A (2003) The crystal structure of moskvinite-(Y), Na2K(Y,REE)[Si6O15], a new silicate mineral with [Si6O15] three-membered double-rings from the Dara-I-Pioz Moraine, Tien-Shan mountains, Tajikistan The Canadian Mineralogist 41 513-520 |  | 2003 | Dara-I-Pioz Moraine, Tien-Shan mountains, Tajikistan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.32 Å | (35) |
| 4.98 Å | (100) |
| 3.45 Å | (50) |
| 3.26 Å | (85) |
| 3.05 Å | (75) |
| 2.753 Å | (42) |
| 2.490 Å | (45) |
Reference:
Comments:
[d in .ANG.,(I/IO)(hkl)]
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Moskvinite-(Y)
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
Occurs in a coarse-grained reedmergnerite pegmatite
Associated Minerals at Type Locality:
Synonyms of Moskvinite-(Y)
Other Language Names for Moskvinite-(Y)
Dutch:Moskviniet-(Y)
German:Moskvinit-(Y)
Russian:Москвинит-(Y)
Simplified Chinese:莫斯克文石
Traditional Chinese:莫斯克文石
Common Associates
Associations Based on Photo Data:
| 1 photo of Moskvinite-(Y) associated with Telyushenkoite | (Cs,Na,K)Na6[Be2Al3Si15O39]F2 |
| 1 photo of Moskvinite-(Y) associated with Shibkovite | K(◻K)Ca2Zn3[Si12O30] |
| 1 photo of Moskvinite-(Y) associated with Reedmergnerite | NaBSi3O8 |
Radioactivity
Radioactivity:
| Element | % Content | Activity (Bq/kg) | Radiation Type |
|---|---|---|---|
| Uranium (U) | 0.0000% | 0 | α, β, γ |
| Thorium (Th) | 0.0000% | 0 | α, β, γ |
| Potassium (K) | 6.7123% | 2,081 | β, γ |
For comparison:
- Banana: ~15 Bq per fruit
- Granite: 1,000–3,000 Bq/kg
- EU exemption limit: 10,000 Bq/kg
Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.
Interactive Simulator:
Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!
Activity: –
| Distance | Dose rate | Risk |
|---|---|---|
| 1 cm | ||
| 10 cm | ||
| 1 m |
The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).
D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield
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 Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Moskvinite-(Y)
mindat.org URL:
https://www.mindat.org/min-27552.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Moskvinite-(Y)
Reference List:
Agakhanov, A. A., Pautov, L. A., Sokolova, E. V., Hawthorne, F. C., Karpenko, V. Y. (2003) Moskvinite-(Y), Na2K(Y, REE)[Si6O15], a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 132 (6) 15-21
Sokolova, E., Hawthorne, F. C., Agakhanov, A. A., Pautov, L. A. (2003) The crystal structure of moskvinite-(Y), Na2K(Y,REE) [Si6O15], a new silicate mineral with [Si6O15] three-membered double rings from the Dara-i-Pioz moraine, Tien-Shan Mountains, Tajikistan. The Canadian Mineralogist, 41 (2) 513-520 doi:10.2113/gscanmin.41.2.513
Localities for Moskvinite-(Y)
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Greenland | |
| Friis (2016) |
Tajikistan (TL) | |
| Agakhanov et al. (2003) +1 other reference |
Quick NavTopAbout Moskvinite-(Y)Unique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesRadioactivityOther InformationInternet Links References Localities Locality List
Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan