Tounkite Mineral Data

General Tounkite Information

Chemical Formula:

(Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O)

Composition:

Molecular Weight = 1,204.49 gm

Potassium 5.19 % K 6.26 % K₂O

Sodium 7.44 % Na 10.03 % Na₂O

Calcium 7.65 % Ca 10.71 % CaO

Aluminum 13.22 % Al 24.97 % Al₂O₃

Silicon 14.22 % Si 30.43 % SiO₂

Hydrogen 0.17 % H 1.50 % H₂O

Sulfur 5.32 % S 13.29 % SO₃

Chlorine 2.94 % Cl 2.94 % Cl

- % Cl -0.66 % -O=Cl₂

Oxygen 43.83 % O

______ ______

100.00 % 99.47 % = TOTAL OXIDE

Empirical Formula:

Na_3.9Ca_2.3K_1.6Si_6.1Al_5.9O₂₄(SO₄)₂Cl•(H₂O)

Environment:

Replaces lazurite in diopside-lazurite rocks.

IMA Status:

Approved IMA 1992

Locality:

Malaya Bystraya and Tultuy lazurite deposits, south of Lake Baikal, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the Tunka (Tounka) Valley near the deposits.

Name Pronunciation:

Tounkite

Synonym:

IMA1990-009

Tounkite Image

Images:

Tounkite

Comments: Light yellow-green crystalline tounkite with dark lazurite in matrix.
Location: Malobystrinskoje, Baikal, Russia. Scale: Not Given.
© Diederik Visser

Tounkite Crystallography

Axial Ratios:

a:c = 1:2.51023

Cell Dimensions:

a = 12.843, c = 32.239, Z = 6; V = 4,605.17 Den(Calc)= 2.61

Crystal System:

Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6₂22

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

By Intensity(I/I_o): 3.711(1), 3.314(0.8), 4.842(0.4),

Physical Properties of Tounkite

Cleavage:

{1010} Good

Color:

Bottle green, Yellow green.

Density:

2.557

Diaphaneity:

Transparent

Habit:

Crystalline - Poor - Occurs primarily as crudely formed crystals.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tounkite

Dichroism (e):

colorless.

Dichroism (w):

yellow green.

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2052,KPDmeas= 0.2094,KC= 0.2067
Ncalc = 1.53 - 1.54

Optical Data:

Uniaxial (+), w=1.528, e=1.543, bire=0.0150.

Calculated Properties of Tounkite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Tounkite =2.61 gm/cc.

Fermion Index:

Fermion Index = 0.0073619432
Boson Index = 0.9926380568

Photoelectric:

PE_Tounkite= 3.03 barns/electron
U=PE_Tounkite x r_electron= 7.83 barns/cc.

Radioactivity:

GRapi = 74.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Tounkite per GRapi unit = 1.35 (%)

Estimated Radioactivity from Tounkite - barely detectable

Tounkite Classification

Dana Class:

76.02.05.14 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.05)Cancrinite group

76.02.05.01 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

76.02.05.02 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 3₁c 3m

76.02.05.03 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

76.02.05.04 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 6₃ 6

76.02.05.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

76.02.05.06 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 3₂1 3 2

76.02.05.07 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 3₁c 3m

76.02.05.08 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 6₃ 6

76.02.05.09 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6m2 6 m2

76.02.05.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

76.02.05.11 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 6₃ 6

76.02.05.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

76.02.05.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

76.02.05.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 6₂22 6 2 2

76.02.05.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 6₃22 6 2 2

76.02.05.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O)(?) P 62m 6 m2

76.02.05.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 3₁c or P 2c Trig

76.02.05.18 Farneseite! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 6₃/m 6/m 2/m 2/m

76.02.05.19 Alloriite! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 3₁c 3m

76.02.05.20 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3

76.02.05.21 IMA2008-006! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3

76.02.05.22 Kyanoxalite! Na7(Al5-6Si6-7O24)(C2O4)0.5-1.0•5H2O P 6₃ 6

76.02.05.23 IMA2008-065! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 6₃ 6

Strunz Class:

09.FB.05 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FB -Tektosilicates with additional anions

09.FB.05 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 3₁c 3m

09.FB.05 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 6₃/mmc, P 6₃mc, or P 62c Hex

09.FB.05 Cancrisilite Na7Al5Si7O24(C03)•3(H2O) P 6₃ 6

09.FB.05 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 6₃ 6

09.FB.05 Hydroxycancrinite Na4(AlSiO4)3(OH)•(H2O) P 6₃ 6

09.FB.05 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10•2(H2O) P 3₂1 3 2

09.FB.05 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6m2 6 m2

09.FB.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 6₃/m 6/m

09.FB.05 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 3₁c 3m

09.FB.05 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 6₃/m 6/m

09.FB.05 Pitiglianoite Na6K2Si6Al6O24(SO4)•2(H2O) P 6₃ 6

09.FB.05 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6₃22 6 2 2

09.FB.05 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 6₃22 6 2 2

09.FB.05 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4•n(H2O) P 6₃/mmc ? 6/m 2/m 2/m

09.FB.05 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 3₁c or P 2c Trig

09.FB.05 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 6₂22 6 2 2

09.FB.05 IMA2008-065! (Na,K)6Ca2(Si6Al6O24)Cl2(CO3) P 6₃ 6

09.FB.05 Farneseite! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12•6(H2O) P 6₃/m 6/m 2/m 2/m

09.FB.05 Biachellaite (Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5•H2O P 3 3

09.FB.05 IMA2008-006! [Na82.5Ca33K16.5](Si99Al99O396)(SO4)33•4H2O P 3 3

09.FB.05 Alloriite! Na5K1.5Ca(Si6Al6O24)(SO4)(OH)0.5•H2O P 3₁c 3m

Other Tounkite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.79,p187,1994) OPTIC PROP.(Am.Min.,Vol.79,p187,1994)

See Also:

Links to other databases for Tounkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Tounkite

(Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O)
Dana No: 76.02.05.14 Strunz No: 09.FB.05
Locality:

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