Beudantite Mineral Data

Beudantite Mineral Data +

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General Beudantite Information

Chemical Formula:

PbFe+++3(AsO4)(SO4)(OH)6

Composition:

Molecular Weight = 711.77 gm

Iron 23.54 % Fe 33.65 % Fe₂O₃

Arsenic 10.53 % As 16.15 % As₂O₅

Hydrogen 0.85 % H 7.59 % H₂O

Lead 29.11 % Pb 31.36 % PbO

Sulfur 4.51 % S 11.25 % SO₃

Oxygen 31.47 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe³⁺₃(AsO₄)(SO₄)(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1826

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist, F. S. Beudant (1787-1850).

Synonym:

Corkite

ICSD 67455

PDF 19-689

Beudantite Image

Images:

Beudantite

Comments: Sharp and lustrous crystals of beudantite to 4 mm across on quartz.
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: 2.7 x 2.5 cm.
© John Veevaert

Images:

Beudantite Scorodite

Comments: Blue, 2 cm in length scorodite crystals on a sparkling matrix of brilliant brown-black beudantite.
Location: Tsumeb, Namibia. Scale: 8 x 5 x 3 cm.
© John Schneider

Beudantite Crystallography

Axial Ratios:

a:c = 1:2.32513

Cell Dimensions:

a = 7.32, c = 17.02, Z = 3; V = 789.79 Den(Calc)= 4.49

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): 3.08(1), 5.99(0.8), 3.67(0.7),

Crystal Structure:

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Szymanski J T , The Canadian Mineralogist , 26 (1988) p.923-932, The crystal structure of beudantite, Pb(Fe,Al)3((As,S)O4)2(OH)6

Physical Properties of Beudantite

Cleavage:

[0001] Perfect

Color:

Brown, Green, Yellow, Dark green, Orange.

Density:

4.1 - 4.3, Average = 4.19

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Blocky - Rhombohedral - Crystal shape resembles rhomohedrons.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4 - Fluorite

Luminescence:

None.

Luster:

Adamantine

Streak:

greenish yellow

Optical Properties of Beudantite

Dichroism (e):

none.

Dichroism (w):

none.

Gladstone-Dale:

CI meas= -0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2116,KPDmeas= 0.2262,KC= 0.2196

Optical Data:

Uniaxial (-), e=1.943, w=1.957, bire=0.0140.

Calculated Properties of Beudantite

Electron Density:

r_electron=3.86 gm/cc
note: r_Beudantite=4.20 gm/cc.

Fermion Index

Fermion Index = 0.06981
Boson Index = 0.93019

Photoelectric:

PE_Beudantite= 501.54 barns/electron
U=PE_Beudantite x r_electron=1,935.52 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Beudantite is Not Radioactive

Beudantite Classification

Dana Class:

43.4.1.1 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.1)Dana Group

43.4.1.1 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.2 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

43.4.1.3 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

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

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

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

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

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

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

43.4.1.10 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

Strunz Class:

VII/B.35-90 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.35 - Beudantite group

VII/B.35-10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

VII/B.35-20 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-30 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-40 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-60 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-65 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

VII/B.35-70 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-75 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

VII/B.35-80 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

VII/B.35-90 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

Other Beudantite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Beudantite

PbFe+++3(AsO4)(SO4)(OH)6
Dana No: 43.4.1.1 Strunz No: VII/B.35-90
Locality:

Notes: