Walthierite Mineral Data

Walthierite Mineral Data +

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General Walthierite Information

Chemical Formula:

Ba0.5Al3(SO4)2(OH)6

Composition:

Molecular Weight = 443.78 gm

Barium 15.47 % Ba 17.28 % BaO

Aluminum 18.24 % Al 34.46 % Al₂O₃

Hydrogen 1.36 % H 12.18 % H₂O

Sulfur 14.45 % S 36.08 % SO₃

Oxygen 50.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_0.5Al₃(SO₄)₂(OH)₆

IMA Status:

Approved IMA 1992

Locality:

Link to MinDat.org Location Data.

Synonym:

IMA1991-008

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Walthierite Crystallography

Axial Ratios:

a:c = 1:4.92605

Cell Dimensions:

a = 6.992, c = 34.443, Z = 6; V = 1,458.26 Den(Calc)= 3.03

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.98(1), 2.283(0.8), 1.909(0.7),

Physical Properties of Walthierite

Cleavage:

[???] Perfect

Color:

White, Yellowish.

Diaphaniety:

Transparent

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Walthierite

Gladstone-Dale:

CI calc= 0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KC= 0.1987

Optical Data:

Uniaxial (+), w=1.588, e=1.604, bire=0.0160.

Calculated Properties of Walthierite

Electron Density:

r_electron=2.96 gm/cc
note: r_Walthierite=3.03 gm/cc.

Fermion Index

Fermion Index = 0.0289
Boson Index = 0.9711

Photoelectric:

PE_Walthierite= 64.89 barns/electron
U=PE_Walthierite x r_electron= 192.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Walthierite is Not Radioactive

Walthierite Classification

Dana Class:

30.2.4.7 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.2)where (A B)2 XO4 Zq

(30.2.4)Alunite Group (Alunite Subgroup)

30.2.4.1 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

30.2.4.2 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.3 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

30.2.4.4 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

30.2.4.5 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.6 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.7 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

30.2.4.8 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

Strunz Class:

VI/B.11-45 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. mostly big cations

VI/B.11 - Alunite group, Natroalunite - Jarosite - Beaverite

VI/B.11-10 Natroalunite NaAl3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-20 Alunite KAl3(SO4)2(OH)6 R 3m, R 3m Trig

VI/B.11-30 Ammonioalunite (NH4)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-40 Minamiite (Na,Ca,K)Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-43 Huangite Ca0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-45 Walthierite Ba0.5Al3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-50 Natrojarosite NaFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-60 Jarosite KFe3(SO4)2(OH)6 R 3 3

VI/B.11-65 Dorallcharite (Tl,K)Fe3(SO4)2(OH)6 R 3m 3 2/m

VI/B.11-70 Ammoniojarosite (NH4)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-80 Hydronium-jarosite (H3O)Fe3(SO4)2(OH)6 R 3m 3m

VI/B.11-90 Argentojarosite AgFe3(SO4)2(OH)6 R 3m 3m

VI/B.11-100 Plumbojarosite PbFe6(SO4)4(OH)12 R 3m 3 2/m

VI/B.11-110 Osarizawaite PbCuAl2(SO4)2(OH)6 R 3m 3m

VI/B.11-120 Beaverite PbCu(Fe,Al)2(SO4)2(OH)6 R 3m 3m

Other Walthierite Information

References:

PHYS. PROP.(Am.Min.,Vol.77,p1275-1284,1992) OPTIC PROP.(Am.Min.,Vol.77,p1275-1284,1992)

See Also:

Links to other databases for Walthierite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Walthierite

Ba0.5Al3(SO4)2(OH)6
Dana No: 30.2.4.7 Strunz No: VI/B.11-45
Locality:

Notes: