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 % Al₂O₃

Zinc 0.91 % Zn 1.13 % ZnO

Gallium 14.55 % Ga 19.56 % Ga₂O₃

Iron 6.22 % Fe 8.89 % Fe₂O₃

Arsenic 11.47 % As 17.59 % As₂O₅

Hydrogen 0.83 % H 7.39 % H₂O

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:

PbGa_1.5Fe³⁺_0.8Al_0.6Zn_0.1(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

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

By Intensity(I/I_o): 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:

PE_{Gallobeudantite}= 504.29 barns/electron
U=PE_{Gallobeudantite} x rElectron 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 3m 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 3m 3 2/m

43.04.01.04 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

43.04.01.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.06 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.07 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.08 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.04.01.09 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 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 3m 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 3m 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 3m 3 2/m

08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 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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