Zeravshanite Mineral Data

General Zeravshanite Information

Chemical Formula:

Cs4Na2Zr3(Si18O45)(H2O)2

Composition:

Molecular Weight = 2,118.63 gm

Cesium 23.84 % Cs 25.27 % Cs₂O

Potassium 0.04 % K 0.04 % K₂O

Sodium 2.37 % Na 3.19 % Na₂O

Zirconium 11.75 % Zr 15.88 % ZrO₂

Titanium 0.43 % Ti 0.72 % TiO₂

Iron 0.11 % Fe 0.15 % Fe₂O₃

Silicon 23.86 % Si 51.05 % SiO₂

Tin 0.22 % Sn 0.28 % SnO₂

Hydrogen 0.38 % H 3.40 % H₂O

Oxygen 37.00 % O

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

Cs_3.8Na_0.18K_0.02Na₂Zr_2.73Ti_0.19Sn_0.04Fe³⁺_0.04Si₁₈O₄₅2(H₂O)₂

Environment:

Found in a pegmatite boulder. New structure type [Si18O45]18-, 5 and 8-member silicate rings in sheet structure.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Glacial moraine of the Dara-i-Pioz clacier, Alai mountain range, Tien-Shan Mountains, Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named after the type locality (Zeravshan Range).

Synonym:

IMA2003-034

Zeravshanite Image

Images:

Zeravshanite

Comments: BSE image of irregular grains of zeravshanite (zerav), sogdianite (sog) and aegirite (aegi).
Location: Dara-i-Pioz, Tadjikistan. Scale: See Image.
© Diederik Visser

Zeravshanite Crystallography

Axial Ratios:

a:b:c =3.4918:1:3.0447

Cell Dimensions:

a = 26.3511, b = 7.5464, c = 22.9769, Z = 4; beta = 107.237° V = 4,363.88 Den(Calc)= 3.22

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.35(1)(712 ), 3.14(0.9)(224 ), 2.62(0.7)(026 ), 2.82(0.5)(716 ), 3.65(0.5)(006 ), 6.32(0.5)(402 ), 1.865(0.4)(538 ), 1.891(0.

Crystal Structure:

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Uvarova Y A , Sokolova E V , Hawthorne F C , Pautov L A , Agakhanov A A , The Canadian Mineralogist , 42 (2004) p.125-134, A novel (Si18O45)18- sheet in the crystal structure of zeravshanite,, Cs4Na2Zr3(Si18O45)(H2O)2

Physical Properties of Zeravshanite

Cleavage:

{???} Distinct

Color:

Colorless.

Density:

3.09

Diaphaneity:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Zeravshanite

Gladstone-Dale:

CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1849,KPDmeas= 0.1927,KC= 0.1912
Ncalc = 1.59 - 1.62

Optical Data:

Biaxial (-), a=1.585, b=1.598, g=1.603, bire=0.0180, 2V(Calc)=62, 2V(Meas)=-63. Dispersion medium, r < v.

Calculated Properties of Zeravshanite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Zeravshanite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Zeravshanite= 113.84 barns/electron
U=PE_Zeravshanite x r_electron= 332.65 barns/cc.

Radioactivity:

Zeravshanite Classification

Dana Class:

72.03.03.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.03)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.03.03)Dana Group

72.03.03.01 Zeravshanite! Cs4Na2Zr3(Si18O45)(H2O)2 C 2/c 2/m

Strunz Class:

09.EA.75 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

09.EA.75 Zeravshanite! Cs4Na2Zr3(Si18O45)(H2O)2 C 2/c 2/m

Other Zeravshanite Information

References:

NAME( CanMin, v 42, p 125) PHYS. PROP.(AmMin, v91, p220) OPTIC PROP.(AmMin, v91, p220)

See Also:

Links to other databases for Zeravshanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Zeravshanite here :
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Print or Cut-and-Paste your Zeravshanite Specimen Label here :

Zeravshanite

Cs4Na2Zr3(Si18O45)(H2O)2
Dana No: 72.03.03.01 Strunz No: 09.EA.75
Locality:

Notes: