Wenkite Mineral Data

Wenkite Mineral Data +

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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 % Na₂O

Calcium 9.51 % Ca 13.31 % CaO

Aluminum 11.99 % Al 22.66 % Al₂O₃

Silicon 11.63 % Si 24.89 % SiO₂

Hydrogen 0.33 % H 2.95 % H₂O

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:

Ba_3.7Ca_5.5Na_0.5Si_9.6Al_10.3O_38.9(OH)₃FCl_0.5(SO₄)_2.9·2.3(H₂O)

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.

Synonym:

ICSD 9338

PDF 19-1418

Wenkite Image

Images:

Wenkite

Comments: Translucent nearly colorless wenkite crystal in vug.
Location: Garpenberg Mine, Kopparberg, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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 DipyramidalH-M Symbol (6 m2) Space Group: P 62m

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

By Intensity(I/I_o): 3.46(1), 2.69(0.9), 3.38(0.8),

Crystal Structure:

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Merlino S , Acta Crystallographica, Section B , 30 (1974) p.1262-1266, The crystal structure of wenkite, Locality: Candoglia, Italy

View Additional jPOWD Structure files for Wenkite
[1]

Physical Properties of Wenkite

Cleavage:

[???] Indistinct

Color:

Light gray.

Diaphaniety:

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

Optical Data:

Uniaxial (-), e=1.589, w=1.596, bire=0.0070.

Calculated Properties of Wenkite

Electron Density:

r_electron=3.00 gm/cc
note: r_Wenkite=3.13 gm/cc.

Fermion Index

Fermion Index = 0.04511
Boson Index = 0.95489

Photoelectric:

PE_Wenkite= 94.20 barns/electron
U=PE_Wenkite x r_electron= 282.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wenkite is Not Radioactive

Wenkite Classification

Dana Class:

76.2.5.16 (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

Strunz Class:

VIII/J.09-100 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 Wenkite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Wenkite

Ba4Ca6(Si,Al)20O39(OH)2(SO4)3·n(H2O) (?)
Dana No: 76.2.5.16 Strunz No: VIII/J.09-100
Locality:

Notes: