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Telyushenkoite

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Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
© Knut Eldjarn

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Formula:
(Cs,Na,K)Na
 
6
[F
 
2
|Be
 
2
Al
 
3
Si
 
15
O
 
39
]
System:TrigonalColour:colourless to white
Hardness:6
Member of:Leifite Group
Name:Honouring Tamara Matveyevna Telyushenko (1930-1997), Professor of Petrography in the Ashkhabad School of Geology.


Leifite Group.
The cesium analogue of leifite and eirikite.

Classification of Telyushenkoite

IMA status:Approved 2001
Strunz 8th edition ID:8/J.10-20
Nickel-Strunz 10th (pending) edition ID:9.EH.25

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
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Type Occurrence of Telyushenkoite

Type Locality:Darai-Pioz (Dara-i-Pioz; Dara-Pioz) Glacier, Alai (Alayskiy) Range, Tien Shan Mts, Region of Republican Subordination, Tajikistan
General Appearance of Type Material:angular grains to 2 cm
Geological Setting of type material:inclusions in coarse-grained blocks consisting mainly of reedmergnerite
Associated Minerals at type locality:
ShibkoviteReedmergneritePolylithionitePectoliteNordite-(Ce)
MicroclineKentbrooksiteHyalotekiteAlbite

Physical Properties of Telyushenkoite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:colourless to white
Streak:white
Hardness (Mohs):6
Hardness (Vickers):VHN100=696 - 737 kg/mm2
Cleavage:Distinct/Good
Density (measured):2.73 g/cm3
Density (calculated):2.73 g/cm3

Crystallography of Telyushenkoite

Crystal System:Trigonal
Class (H-M):3m (3 2/m) - Hexagonal Scalenohedral
Space Group:P3 1m {P3 1 2/m}
Space Group Setting:P3 1m
Cell Parameters:a = 14.377Å, c = 4.878Å
Ratio:a:c = 1 : 0.339
Unit Cell Volume:V 873.19 ų (Calculated from Unit Cell)
Z:1
Morphology:Equant grains to 2 cm.
X-Ray Powder Diffraction:
d-spacingIntensity
4.15 (50)
3.38 (75)
3.16 (100)

Optical Data of Telyushenkoite

Type:Uniaxial (+)
RI values: nω = 1.526() nε = 1.531(2)
Maximum Birefringence:δ = 0.005

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low

Chemical Properties of Telyushenkoite

Formula:
(Cs,Na,K)Na
 
6
[F
 
2
|Be
 
2
Al
 
3
Si
 
15
O
 
39
]
Essential elements:Al, Be, Cs, F, Na, O, Si
All elements listed in formula:Al, Be, Cs, F, K, Na, O, Si
Common Impurities:Zn

Relationship of Telyushenkoite to other Species

Member of:Leifite Group
Other Members of Group:

- +
Eirikite
KNa
 
6
Be
 
2
(Si
 
15
Al
 
3
)O
 
39
F
 
2
Leifite
(Na,H
 
2
O)Na
 
6
[F
 
2
|Be
 
2
Al
 
2
(Al,Si)Si
 
15
O
 
39
]
Related Minerals - Nickel-Strunz Grouping):

- +
9.EH.05Manganoneptunite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
9.EH.05Neptunite
Na
 
2
KLi(Fe
2+
 
,Mn
2+
 
)
 
2
Ti
 
2
(Si
 
8
O
 
24
)
9.EH.05Watatsumiite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
V
4+
2
[Si
 
8
O
 
24
]
9.EH.05Magnesioneptunite
KNa
 
2
Li(Mg,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
9.EH.10Grumantite
Na(HSi
 
2
O
 
5
) · H
 
2
O
9.EH.15Sarcolite
Na
 
2
Ca
 
12
(Ca,K,Fe,Sr,Mg)
 
2
Al
 
8
Si
 
12
(P,Si)O
 
52
F
 
2
9.EH.20Ussingite
Na
 
2
AlSi
 
3
O
 
8
OH
9.EH.25Leifite
(Na,H
 
2
O)Na
 
6
[F
 
2
|Be
 
2
Al
 
2
(Al,Si)Si
 
15
O
 
39
]
9.EH.25Eirikite
KNa
 
6
Be
 
2
(Si
 
15
Al
 
3
)O
 
39
F
 
2
9.EH.30Nafertisite
Na
 
3
(Fe
2+
 
,Fe
3+
 
)
 
6
(Ti
 
2
Si
 
12
O
 
34
)(O,OH)
 
7
 · 2H
 
2
O

Other Names for Telyushenkoite

Synonyms:
IMA2001-012
Other Languages:
Russian:Телюшенкоит

Other Information

Fluorescence in UV light:weak lilac fluorescence in short-wave UV light
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Telyushenkoite

Reference List:

- +
Sokolova E. et al. (2002), Canadian Mineralogist: 40: 183-192.

Agakhanov A.A. et al. (2003), New Data on Minerals, 38, 5-8.

Internet Links for Telyushenkoite

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    • Localities for Telyushenkoite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Tajikistan
     
    • Region of Republican Subordination
      • Tien Shan Mts
        • Alai (Alayskiy) Range
    		Lapis 29(1), 47 (2004); Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 132(6): 15-21 (in Russian).
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