Wenkite Mineral Data
General Wenkite Information
Chemical Formula:
Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O) (?)
Composition:
Molecular Weight = 2,317.71 gm
Barium 21.92 % Ba 24.48 % BaO
Sodium 0.50 % Na 0.67 % Na2 O
Calcium 9.51 % Ca 13.31 % CaO
Aluminum 11.99 % Al 22.66 % Al2 O3
Silicon 11.63 % Si 24.89 % SiO2
Hydrogen 0.33 % H 2.95 % H2 O
Sulfur 4.01 % S 10.02 % SO3
Chlorine 0.76 % Cl 0.76 % Cl
- %
Cl -0.17 % -O=Cl2
Oxygen 38.52 % O
Fluorine 0.82 % F 0.82 % F
- %
F -0.35 % -O=F2
______ ______
100.00 % 100.03 % = TOTAL OXIDE
Empirical Formula:
Ba3.7 Ca5.5 Na0.5 Si9.6 Al10.3 O38.9 (OH)3 FCl0.5 (SO4 )2.9 �2.3(H2 O)
Environment:
Formed between barite layers and calc-silicate rock, a product of strong metamorphism of limestones.
IMA Status:
Approved IMA 1962
Locality:
At Cava Mergozzoni, Candoglia, Piedmont, Ital. Link to MinDat.org Location Data.
Name Origin:
Named for Eduard Wenk (1907-), mineralogist and petrologist, University of Basel, Basel, Switzerland.
Name Pronunciation:
Wenkite
Synonym:
ICSD 9338
PDF 19-1418
Wenkite Image
Images:
Wenkite Crystallography
Axial Ratios:
a:c = 1:0.55229
Cell Dimensions:
a = 13.511, c = 7.462, Z = 1; V = 1,179.67 Den(Calc)= 3.26
Crystal System:
Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 6 2m
X Ray Diffraction:
By Intensity(I/Io ): 3.46(1), 2.69(0.9), 3.38(0.8),
Physical Properties of Wenkite
Cleavage:
{???} Indistinct
Color:
Light gray.
Diaphaneity:
Transparent to Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Columnar - Forms columns
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Wenkite
Gladstone-Dale:
CI meas = 0.003 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.042 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1817,KPDmeas = 0.1893,KC = 0.1898 Ncalc = 1.59 - 1.62
Optical Data:
Uniaxial (-), e=1.589, w=1.596, bire=0.0070.
Calculated Properties of Wenkite
Electron Density:
Bulk Density (Electron Density)=3.00 gm/cc note: Specific Gravity of Wenkite =3.13 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEWenkite = 94.20 barns/electronU=PEWenkite x r Electron Density= 282.12 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Wenkite is Not Radioactive
Wenkite Classification
Dana Class:
76.02.05.16 (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.GD.25 09 - SILICATES (Germanates)
09.G - Tektosilicates with Zeolitic H2O
09.GD -Chains of 6-membered rings � tabular zeolites
09.GD.25 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6 m2 6 m2
09.GD.25 Wenkite Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O)(?) P 6 2m 6 m2
Other Wenkite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Wenkite :
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
15 - Scandinavian mineral gallery
16 - WWW-MINCRYST
17 - Zeolite Database by Bruno Herreros
Search for Wenkite using:
[AOL ]
[Bing ]
[Dog Pile ]
[GeoScienceWorld ]
[HotBot ]
[Ixquick ]
[Lycos ]
[MAMMA ]
[Scirus ]
[Teoma ]
[WebCrawler ]
[Wikipedia ]
[YAHOO ]
Visit our Advertisers for Wenkite :
Ask about Wenkite 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 Wenkite Specimen Label here :
Wenkite
Ba4Ca6(Si,Al)20O39(OH)2(SO4)3•n(H2O) (?)
Dana No: 76.02.05.16 Strunz No: 09.GD.25
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.