Mineralogy Database

Tounkite Mineral Data

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General Tounkite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na3.9Ca2.3K1.6Si6.1Al5.9O24(SO4)2Cl•(H2O)
Help on Environment: Environment: Replaces lazurite in diopside-lazurite rocks.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Malaya Bystraya and Tultuy lazurite deposits, south of Lake Baikal, Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Tunka (Tounka) Valley near the deposits.
Help on Name Pronunciation: Name Pronunciation: Tounkite Say TOUNKITE
Help on Synonym: Synonym: IMA1990-009
 

Tounkite Image

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  Tounkite

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

Tounkite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.51023
Help on Cell Dimensions: Cell Dimensions: a = 12.843, c = 32.239, Z = 6; V = 4,605.17 Den(Calc)= 2.61
Help on Crystal System: 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/Io): 3.711(1), 3.314(0.8), 4.842(0.4),
 

Physical Properties of Tounkite

Help on Cleavage: Cleavage: {1010} Good
Help on Color: Color: Bottle green, Yellow green.
Help on Density: Density: 2.557
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Crystalline - Poor - Occurs primarily as crudely formed crystals.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Tounkite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): yellow green.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.528, e=1.543, bire=0.0150.
 

Calculated Properties of Tounkite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Tounkite =2.61 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073619432
Boson Index = 0.9926380568
Help on Photoelectric: Photoelectric: PETounkite = 3.03 barns/electron
U=PETounkite x relectron= 7.83 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.79,p187,1994) OPTIC PROP.(Am.Min.,Vol.79,p187,1994)
Help on See Also: 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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Print or Cut-and-Paste your Tounkite Specimen Label here :

Tounkite

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

 

Notes:

 

 
   
 


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