Gallobeudantite Mineral Data
General Gallobeudantite Information
Chemical Formula:
PbGa3[(AsO4),(SO4)]2(OH)6
Composition:
Molecular Weight = 718.80 gm
Aluminum 2.25 % Al 4.26 % Al2 O3
Zinc 0.91 % Zn 1.13 % ZnO
Gallium 14.55 % Ga 19.56 % Ga2 O3
Iron 6.22 % Fe 8.89 % Fe2 O3
Arsenic 11.47 % As 17.59 % As2 O5
Hydrogen 0.83 % H 7.39 % H2 O
Lead 28.83 % Pb 31.05 % PbO
Sulfur 4.01 % S 10.02 % SO3
Oxygen 30.94 % O
______ ______
100.00 % 99.89 % = TOTAL OXIDE
Empirical Formula:
PbGa1.5 Fe3+ 0.8 Al0.6 Zn0.1 (AsO4 )1.1 (SO4 )0.9 (OH)5.9
Environment:
A secondary mineral in vugs of oxidized ore.
IMA Status:
Approved IMA 1996 (Dana # Added)
Locality:
Tsumeb, Namibia. Link to MinDat.org Location Data.
Name Origin:
For the relationship to beudantite and the gallium content.
Name Pronunciation:
Gallobeudantite + Pronunciation
Synonym:
IMA1994-021
Gallobeudantite Crystallography
Axial Ratios:
a:c = 1:2.35709
Cell Dimensions:
a = 7.225, c = 17.03, Z = 3; V = 769.88 Den(Calc)= 4.65
Crystal System:
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
X Ray Diffraction:
By Intensity(I/Io ): 3.038(1), 5.85(0.9), 3.59(0.4),
Physical Properties of Gallobeudantite
Cleavage:
{001} Indistinct
Color:
Pale yellow, Slightly greenish yellow, Cream.
Density:
4.58
Diaphaneity:
Transparent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Disseminated - Occurs in small, distinct particles dispersed in matrix.
Habit:
Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Hardness:
4 - Fluorite
Luster:
Vitreous - Adamantine
Streak:
pale yellowish white
Optical Properties of Gallobeudantite
Gladstone-Dale:
CI meas = 0.105 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = 0.118 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1627,KPDmeas = 0.1652,KC = 0.1845 Ncalc = 1.85 - 1.86
Optical Data:
Uniaxial (-), e=1.75, w=1.763, bire=0.0130.
Calculated Properties of Gallobeudantite
Electron Density:
Bulk Density (Electron Density)=4.18 gm/cc note: Specific Gravity of Gallobeudantite =4.58 gm/cc.
Fermion Index:
Fermion Index = 0.06 Boson Index = 0.94
Photoelectric:
PEGallobeudantite = 504.29 barns/electronU=PEGallobeudantite x r Electron Density=2,107.21 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gallobeudantite is Not Radioactive
Gallobeudantite Classification
Dana Class:
43.04.01.10 (43) Compound Phosphates, etc.
(43.04) (Anhydrous Compound Anions With Hydroxyl or Halogen)
(43.04.01) Beudantite Group
43.04.01.01 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.02 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m
43.04.01.03 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.04 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3 m 3 2/m
43.04.01.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.06 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.07 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.08 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3 m 3 2/m
43.04.01.09 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3 m 3 2/m
43.04.01.10 Gallobeudantite ! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m
Strunz Class:
08.BL.05 08 - PHOSPHATES, ARSENATES, VANADATES
08.B - Phosphates, etc. with Additional Anions, without H2O
08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1
08.BL.05 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
08.BL.05 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m
08.BL.05 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
08.BL.05 Gallobeudantite ! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m
08.BL.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3 m 3 2/m
08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3 m 3 2/m
08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3 m 3 2/m
08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3 m 3 2/m
08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3 m 3 2/m
08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3 m 3 2/m
Other Gallobeudantite Information
References:
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p1039,1997) OPTIC PROP.(MinRec)
See Also:
Links to other databases for Gallobeudantite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST
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Gallobeudantite
PbGa3[(AsO4),(SO4)]2(OH)6
Dana No: 43.04.01.10 Strunz No: 08.BL.05
Locality:
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