Proudite Mineral Data

Proudite Mineral Data +

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General Proudite Information

Chemical Formula:

(Pb,Cu)8Bi9-10(S,Se)22

Composition:

Molecular Weight = 4,594.77 gm

Copper 1.38 % Cu

Bismuth 42.30 % Bi

Lead 33.82 % Pb

Selenium 12.03 % Se

Sulfur 10.47 % S

______

100.00 %

Empirical Formula:

CuPb_7.5Bi_9.3S₁₅Se₇

Environment:

With large, presumably hydrothermal magnetite bodies.

IMA Status:

Approved IMA 1976

Locality:

Juno mine, Tennant Creek, Northern Territory, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for J. S. Proud, a Director of the Peko-Wallsend mining

Synonym:

ICSD 30778

PDF 30-491

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Proudite Crystallography

Axial Ratios:

a:b:c =7.7572:1:8.9053

Cell Dimensions:

a = 31.96, b = 4.12, c = 36.69, Z = 4; beta = 109.52° V = 4,553.49 Den(Calc)= 6.70

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.96(1), 2.059(0.86), 3.494(0.65),

Crystal Structure:

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Mumme W G , American Mineralogist , 61 (1976) p.839-852, Proudite from Tennant Creek, Northern Territory, Australia: Its crystal, structure and relationship with weibullite and wittite

Physical Properties of Proudite

Cleavage:

[hk0] Good

Color:

Silver gray.

Density:

7.12

Diaphaniety:

Opaque

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Optical Properties of Proudite

Gladstone-Dale:

CI meas= -0.545 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.642 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.1919,KC= 0.1242

Optical Data:

Biaxial (+), b=2.4, 2V(Meas)=~70. Dispersion r > v very strong.

Pleochroism (x):

dark brownish red.

Pleochroism (y):

yellow.

Pleochroism (z):

brownish yellow.

Calculated Properties of Proudite

Electron Density:

r_electron=5.87 gm/cc
note: r_Proudite=7.12 gm/cc.

Fermion Index

Fermion Index = 0.08467
Boson Index = 0.91533

Photoelectric:

PE_Proudite=1,467.12 barns/electron
U=PE_Proudite x r_electron=8,611.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Proudite is Not Radioactive

Proudite Classification

Dana Class:

3.6.1.1 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.1)Dana Group

3.6.1.1 Proudite (Pb,Cu)8Bi9-10(S,Se)22 C 2/m 2/m

Strunz Class:

II/E.34-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.34 - Cosalite - Galenobismuthite

II/E.34-08 Mozgovaite! PbBi4(S,Se)7 Bbmm 2/m 2/m 2/m

II/E.34-10 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m

II/E.34-20 Proudite (Pb,Cu)8Bi9-10(S,Se)22 C 2/m 2/m

II/E.34-30 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m

II/E.34-60 Cannizzarite Pb4Bi6S13 C 2/m 2/m

II/E.34-65 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m

II/E.34-70 Nordstromite Pb3CuBi7(S10Se4) P 2₁/m 2/m

II/E.34-80 Junoite Pb3Cu2Bi8(S,Se)16 C 2/m 2/m

II/E.34-85 Felbertalite! Cu2Pb6Bi8S19 C 2/m 2/m

II/E.34-90 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

II/E.34-100 Paderaite AgPb2Cu6Bi11S22 P 2₁/m 2/m

II/E.34-110 Galenobismutite PbBi2S4 Pnam 2/m 2/m 2/m

Other Proudite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1)

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Proudite

(Pb,Cu)8Bi9-10(S,Se)22
Dana No: 3.6.1.1 Strunz No: II/E.34-20
Locality:

Notes: