Telyushenkoite Mineral Data (original) (raw)
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
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Cs0.69Na0.3K0.14Rb0.01Na6Be2.04Si15.46Al2.06Zn0.3O38.84F2.16
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
X Ray Diffraction:
By Intensity(I/Io): 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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| | 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:
PETelyushenkoite = 27.19 barns/electron
U=PETelyushenkoite x relectron= 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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Telyushenkoite
CsNa6[Be2(Si,Al)18O39F2]
Dana No: 78.07.10.02 Strunz No: 09.EH.25
Locality:
Notes: