Zeravshanite
A valid IMA mineral species
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About Zeravshanite
Formula:
Na2Cs4Zr3[Si18O45]*2H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
3.09
Crystal System:
Monoclinic
Name:
Named by L.A. Pautov, A.A. Agakhanov, Yu.A. Uvarova, E. Sokolova, and F.C. Hawthorne in 2004 after the Zarafshan Range. The type material was found in moriane of the Dara-i-Pioz glacier at the junction of the Zeravshan, Turkestan, and Alay Ranges in Tajikistan.
This page provides mineralogical data about Zeravshanite.
Unique Identifiers
Mindat ID:
25702
Long-form identifier:
mindat:1:1:25702:0
IMA Classification of Zeravshanite
Approved
IMA Formula:
Na2Cs4Zr4+3Si18O45·2H2O
Approval year:
2003
First published:
2004
Classification of Zeravshanite
9.EA.75
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered 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 |
|---|---|---|
| Zer | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Zeravshanite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
6 on Mohs scale
Hardness:
VHN50=805 - 880 kg/mm2 - Vickers
Cleavage:
Distinct/Good
In one direction
In one direction
Density:
3.09(5) g/cm3 (Measured) 3.17 g/cm3 (Calculated)
Optical Data of Zeravshanite
Type:
Biaxial (-)
RI values:
nα = 1.585(2) nβ = 1.598(2) nγ = 1.603(2)
2V:
Calculated: -63°
Max. Birefringence:
δ = 0.018
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:
Moderate (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.
No measured or calculated 2V is on file for this mineral, so the value used here (63°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
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.
No measured or calculated 2V is on file for this mineral, so the value used here (63°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
Medium v > r
Chemistry of Zeravshanite
Mindat Formula:
Na2Cs4Zr3[Si18O45]*2H2O
Element Weights:
Crystallography of Zeravshanite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 26.3511(8) Å, b = 7.5464(3) Å, c = 22.9769(8) Å
β = 107.237(1)°
β = 107.237(1)°
Ratio:
a:b:c = 3.492 : 1 : 3.045
Unit Cell V:
4,363.88 ų (Calculated from Unit Cell)
Z:
4
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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CIF File Best | x | y | z | a | b | c
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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) |
|---|---|---|---|---|---|---|---|
| 0005930 | Zeravshanite | Uvarova Y A, Sokolova E V, Hawthorne F C, Pautov L A, Agakhanov A A (2004) A novel (Si18O45)18- sheet in the crystal structure of zeravshanite, Cs4Na2Zr3(Si18O45)(H2O)2 The Canadian Mineralogist 42 125-134 | ![]() | 2004 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.35 Å | (100) |
| 3.14 Å | (90) |
| 2.62 Å | (70) |
| 6.32 Å | (50) |
| 3.65 Å | (50) |
| 2.82 Å | (50) |
| 3.25 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Zeravshanite
General Appearance of Type Material:
Tabular crystals to 0.1 mm.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia.
Associated Minerals at Type Locality:
Synonyms of Zeravshanite
Other Language Names for Zeravshanite
Dutch:Zeravshaniet
German:Zeravshanit
Russian:Зеравшанит
Simplified Chinese:单斜锆铯大隅石
Traditional Chinese:單斜鋯銫大隅石
Common Associates
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA. | Miyawakiite-(Y) | ◻Y4Fe2(Si8O20)(CO3)4(H2O)3 |
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Hydroxyapophyllite-(NH4) | (NH4)Ca4(Si8O20)(OH)(H2O)8 |
| 9.EA. | Fluorapophyllite-(NH4) | NH4Ca4(Si8O20)F · 8H2O |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.07 | Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.30 | Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Perettiite-(Y) | Y2Mn4FeSi2B8O24 |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2Zr(Si4O11) · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Other Information
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 Zeravshanite
mindat.org URL:
https://www.mindat.org/min-25702.html
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Please feel free to link to this page.
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References for Zeravshanite
Reference List:
Pautov, Leonid A., Agakhanov, Atali A., Uvarova, Yulia A., Sokolova, Elena V., Hawthorne, Frank C. (2004) Zeravshanite, Cs4Na2Zr3(Si18O45)(H2O)2, new cesium mineral from Darai-Pioz massif (Tajikistan) New Data on Minerals, 39. Moscow. 21-25
Uvarova, Y. A., Sokolova, E., Hawthorne, F. C., Pautov, L. A., Agakhanov, A. A. (2004) A novel [Si18O45]18- sheet in the crystal structure of zeravshanite, Cs4Na2Zr3[Si18O45](H2O)2. The Canadian Mineralogist, 42 (1) 125-134 doi:10.2113/gscanmin.42.1.125
Pautov, Leonid A., Agakhanov, Atali A., Uvarova, Yulia A., Sokolova, Elena V., Hawthorne, Frank C. (2004) Zeravshanite, Cs4Na2Zr3(Si18O45)(H2O)2, new cesium mineral from Darai-Pioz massif (Tajikistan) New Data on Minerals, 39. Moscow. 21-25
Localities for Zeravshanite
Showing 1 localities.
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.
Tajikistan (TL) | |
| Pautov et al. (2004) +3 other references |
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The
Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan