Tounkite Mineral Data + Say TOUNKITE

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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 Synonym: Synonym: IMA1990-009
 

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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 - TrapezohedralH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.58 gm/cc
note: rTounkite =2.61 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00736
Boson Index = 0.99264
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)

Estimated Radioactivity from Tounkite - barely detectable

 

Tounkite Classification
Help on Dana Class: Dana Class: 76.2.5.14 (76)Tectosilicate Al-Si Framework
  (76.2)Feldspathoids and related species
  (76.2.5)Cancrinite group
 
76.2.5.1 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 63/mmc, P 63mc, or P 62c Hex
 
76.2.5.2 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m
 
76.2.5.3 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
 
76.2.5.4 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6
 
76.2.5.5 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m
 
76.2.5.6 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2
 
76.2.5.7 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m
 
76.2.5.8 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6
 
76.2.5.9 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2
 
76.2.5.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2
 
76.2.5.11 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6
 
76.2.5.12 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m
 
76.2.5.13 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 63/mmc ? 6/m 2/m 2/m
 
76.2.5.14 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2
 
76.2.5.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2
 
76.2.5.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2
 
76.2.5.17 Marinellite! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6(H2O) P 31c or P 2c Trig
 
76.2.5.18 IMA2004-043! (Na37K9Ca10)S56(Si42Al42)S84O168(SO4)12·6(H2O) P 63/m 6/m 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/J.09-55 VIII - Silicates
  VIII/J - Tectosilicates (network) with anions unfamiliar to the tetraheders
  VIII/J.09 - Cancrinite group
 
VIII/J.09-05 Hydroxycancrinite Na4(AlSiO4)3(OH)·(H2O) P 63 6
 
VIII/J.09-10 Cancrinite Na6Ca2Al6Si6O24(CO3)2 P 63 6
 
VIII/J.09-15 Cancrisilite Na7Al5Si7O24(C03)·3(H2O) P 63 6
 
VIII/J.09-20 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63/m 6/m
 
VIII/J.09-25 Quadridavyne (Na,K)6Ca2Al6Si6O24Cl4 P 63/m 6/m
 
VIII/J.09-30 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 6322 6 2 2
 
VIII/J.09-40 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2·5H2O P 31c 3m
 
VIII/J.09-45 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5·(H2O) P 31c 3m
 
VIII/J.09-50 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O) P 63/mmc, P 63mc, or P 62c Hex
 
VIII/J.09-55 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O) P 6222 6 2 2
 
VIII/J.09-60 Sacrofanite (Na,Ca,K)9Si6Al6O24[(OH),(SO4),(CO3),Cl)]4·n(H2O) P 63/mmc ? 6/m 2/m 2/m
 
VIII/J.09-65 Pitiglianoite Na6K2Si6Al6O24(SO4)·2(H2O) P 63 6
 
VIII/J.09-70 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4·n(H2O) P 6322 6 2 2
 
VIII/J.09-80 Franzinite [(Na,K)30Ca10][Si30Al30O120](SO4)10·2(H2O) P 321 3 2
 
VIII/J.09-90 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4·(H2O) P 6m2 6 m2
 
VIII/J.09-100 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O)(?) P 62m 6 m2
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Tounkite

(Na,Ca,K)8Al6Si6O24(SO4)2Cl·(H2O)
Dana No: 76.2.5.14 Strunz No: VIII/J.09-55
Locality:

 

Notes:

 
 
   
 
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