Wickenburgite Mineral Data

Wickenburgite Mineral Data +

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General Wickenburgite Information

Chemical Formula:

Pb3CaAl2Si10O27·4(H2O)

Composition:

Molecular Weight = 1,500.54 gm

Calcium 2.67 % Ca 3.74 % CaO

Aluminum 3.60 % Al 6.79 % Al₂O₃

Silicon 18.72 % Si 40.04 % SiO₂

Hydrogen 0.54 % H 4.80 % H₂O

Lead 41.43 % Pb 44.62 % PbO

Oxygen 33.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₃CaAl₂Si₁₀O₂₇·4(H₂O)

IMA Status:

Approved IMA 1968

Locality:

near Wichenburg, Maricopa County, Arizona. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 79154

PDF 21-148

Wickenburgite Image

Images:

Wickenburgite

Comments: Transparent colorless wickenburgite microcrystals.
Location: Wickenburg, Maricopa County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wickenburgite Crystallography

Axial Ratios:

a:c = 1:2.36002

Cell Dimensions:

a = 8.555, c = 20.19, Z = 2; V = 1,279.70 Den(Calc)= 3.89

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3₁c

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

By Intensity(I/I_o): 10.1(1), 3.26(0.8), 3.93(0.6),

Crystal Structure:

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Lam A E , Groat L A , The Canadian Mineralogist , 32 (1994) p.525-532, The crystal structure of wickenburgite, Pb3CaAl[AlSi10O27](H2O)3, a sheet, structure, Sample: UBC refinement

View Additional jPOWD Structure files for Wickenburgite
[1]

Physical Properties of Wickenburgite

Cleavage:

[???] Indistinct, [0001] Distinct

Color:

Colorless, White, Pink.

Density:

3.85

Hardness:

5 - Apatite

Luminescence:

Fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Wickenburgite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1722,KPDmeas= 0.174,KC= 0.1809

Optical Data:

Uniaxial (-), e=1.648, w=1.6918, bire=0.0438.

Calculated Properties of Wickenburgite

Electron Density:

r_electron=3.53 gm/cc
note: r_{Wickenburgite}=3.85 gm/cc.

Fermion Index

Fermion Index = 0.10048
Boson Index = 0.89952

Photoelectric:

PE_{Wickenburgite}= 694.74 barns/electron
U=PE_{Wickenburgite} x r_electron=2,452.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wickenburgite is Not Radioactive

Wickenburgite Classification

Dana Class:

74.2.1.1 (74)Phyllosilicate Modulated Layers

(74.2)Dana Type

(74.2.1)Dana Group

74.2.1.1 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 3₁c 3m

Strunz Class:

VIII/H.38-90 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures

VIII/H.38 - Monteregianite-(Y) - Wickenburgite series

VIII/H.38-10 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

VIII/H.38-20 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

VIII/H.38-30 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

VIII/H.38-40 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

VIII/H.38-50 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

VIII/H.38-60 Cymrite BaAl2Si2O8·(H2O) P 2₁ (pseudo-HEX) 2

VIII/H.38-65 Kampfite! Ba6[(Si,Al)O2]8(CO3)2Cl2(Cl,H2O)2 P 6₃mmc, P 6₂c, P 6₃mc, P 3₁ Hex

VIII/H.38-80 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex

VIII/H.38-90 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 3₁c 3m

Other Wickenburgite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin v 89, p 471) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Wickenburgite :
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 - WWW-MINCRYST 14 - YupRocks 15 -École des Mines de Paris

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Wickenburgite

Pb3CaAl2Si10O27·4(H2O)
Dana No: 74.2.1.1 Strunz No: VIII/H.38-90
Locality:

Notes: