Telyushenkoite Mineral Data

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General Telyushenkoite Information

Chemical Formula:

CsNa6[Be2(Si,Al)18O39F2]

Composition:

Molecular Weight = 1,433.11 gm

Cesium 6.40 % Cs 6.78 % Cs₂O

Potassium 0.38 % K 0.46 % K₂O

Rubidium 0.06 % Rb 0.07 % Rb₂O

Sodium 10.11 % Na 13.62 % Na₂O

Beryllium 1.28 % Be 3.56 % BeO

Aluminum 3.88 % Al 7.33 % Al₂O₃

Zinc 1.37 % Zn 1.70 % ZnO

Silicon 30.30 % Si 64.82 % SiO₂

Oxygen 43.36 % O

Fluorine 2.86 % F 2.86 % F

- % F -1.21 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cs_0.69Na_0.3K_0.14Rb_0.01Na₆Be_2.04Si_15.46Al_2.06Zn_0.3O_38.84F_2.16

Environment:

In reedmergnerite boulders on the moraine of the Dara-i-Pioz glacier. (related to leifite; structure)

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Moraine of the Darai-Pioz glacier in northern Tajikistan. Link to MinDat.org Location Data.

Name Origin:

Named for Tamara Matveyevna Telyushenko (1930–1997), a petrographer who made major contributions to knowledge of the geology of Central Asia and who headed the Young Geologists’ Sch ool of Ashkhabad for over thirty years

Synonym:

IMA2001-012

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Telyushenkoite Crystallography

Axial Ratios:

a:c = 1:0.33933

Cell Dimensions:

a = 14.377, c = 4.8786, Z = 1; V = 873.30 Den(Calc)= 2.72

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 3.162(1)(031), 3.382(0.75)(121), 4.149(0.5)(030),3.456(0.4)(130), 3.113(0.36)(040), 6.226(0.35)(020), 2.465(0.3)(231),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above

Sokolova E V , Huminicki D M C , Hawthorne F C , Agakhanov A A , Pautov L A , Grew E S , The Canadian Mineralogist , 40 (2002) p.183-192, The crystal chemistry of telyushenkoite and leifite, A Na6[Be2Al3Si15O39F2],, A = Cs, Na

Physical Properties of Telyushenkoite

Cleavage:

{100} Distinct

Color:

White, Colorless.

Density:

2.73

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Telyushenkoite

Gladstone-Dale:

CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2009,KPDmeas= 0.2002,KC= 0.1975
Ncalc = 1.54

Optical Data:

Uniaxial (+), w=1.562, e=1.531, bire=0.0310.

Calculated Properties of Telyushenkoite

Electron Density:

Bulk Density (Electron Density)=2.67 gm/cc
note: Specific Gravity of Telyushenkoite =2.73 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Telyushenkoite}= 27.19 barns/electron
U=PE_{Telyushenkoite} x r_electron= 72.59 barns/cc.

Radioactivity:

GRapi = 30.13 (Gamma Ray American Petroleum Institute Units)
Concentration of Telyushenkoite per GRapi unit = 3.32 (%)

Estimated Radioactivity from Telyushenkoite - barely detectable

Telyushenkoite Classification

Dana Class:

78.07.10.02 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.10)Dana Group

78.07.10.01 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m

78.07.10.02 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m

78.07.10.03 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m

Strunz Class:

09.EH.25 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EH -Transitional structures between phyllosilicate and other silicate units

09.EH.25 Leifite Na2(Si,Al,Be)7(O,OH,F)14 P 3m1 3 2/m

09.EH.25 Telyushenkoite! CsNa6[Be2(Si,Al)18O39F2] P 3m1 3 2/m

09.EH.25 Eirikite! KNa6Be2(Si15Al3)O39F2 P 3m1 3 2/m

Other Telyushenkoite Information

References:

NAME( CanMin, v 40, p 183) PHYS. PROP.(CanMin, v 40, p 183) OPTIC PROP.(CanMin, v 40, p 183)

See Also:

Links to other databases for Telyushenkoite :
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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Print or Cut-and-Paste your Telyushenkoite Specimen Label here :

Telyushenkoite

CsNa6[Be2(Si,Al)18O39F2]
Dana No: 78.07.10.02 Strunz No: 09.EH.25
Locality:

Notes: