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 % K2 O
Sodium 7.44 % Na 10.03 % Na2 O
Calcium 7.65 % Ca 10.71 % CaO
Aluminum 13.22 % Al 24.97 % Al2 O3
Silicon 14.22 % Si 30.43 % SiO2
Hydrogen 0.17 % H 1.50 % H2 O
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:
Na3.9 Ca2.3 K1.6 Si6.1 Al5.9 O24 (SO4 )2 Cl•(H2 O)
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 62 22
X Ray Diffraction:
By Intensity(I/Io ): 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:
PETounkite = 3.03 barns/electronU=PETounkite 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 63 mc, or P 6 2c Hex
76.02.05.02 Bystrite (Na,K)7Ca(Si6Al6)O24S4.5•(H2O) P 31 c 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 32 1 3 2
76.02.05.07 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31 c 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 6 m2 6 m2
76.02.05.10 Microsommite (Na,Ca,K)7-8(Si,Al)12O24(Cl,SO4)2-3 P 63 22 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 62 22 6 2 2
76.02.05.15 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 63 22 6 2 2
76.02.05.16 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O)(?) P 6 2m 6 m2
76.02.05.17 Marinellite ! [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2•6(H2O) P 31 c 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 31 c 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 31 c 3m
09.FB.05 Afghanite (Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O) P 63 /mmc, P 63 mc, or P 6 2c 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 32 1 3 2
09.FB.05 Liottite (Ca,Na,K)8(Si,Al)12O24[(SO4),(CO3),Cl,OH]4•(H2O) P 6 m2 6 m2
09.FB.05 Davyne Na4K2Ca2Si6Al6O24(SO4)Cl2 P 63 /m 6/m
09.FB.05 Giuseppettite [Na42K16Ca6]S64Si48Al48O192(SO4)10Cl2•5H2O P 31 c 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 63 22 6 2 2
09.FB.05 Vishnevite (Na,Ca,K)6(Si,Al)12O24[(SO4),(CO3),Cl2]2-4•n(H2O) P 63 22 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 31 c or P 2c Trig
09.FB.05 Tounkite (Na,Ca,K)8Al6Si6O24(SO4)2Cl•(H2O) P 62 22 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 31 c 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
Search for Tounkite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Tounkite :
Ask about Tounkite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
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:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.