Watkinsonite Mineral Data

Watkinsonite Mineral Data +

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General Watkinsonite Information

Chemical Formula:

PbCu2Bi4(Se,S)8

Composition:

Molecular Weight = 1,731.55 gm

Copper 7.34 % Cu

Bismuth 48.28 % Bi

Lead 11.97 % Pb

Selenium 29.64 % Se

Sulfur 2.78 % S

______

100.00 %

Empirical Formula:

PbCu₂Bi₄Se_6.5S_1.5

Environment:

In a vein-type uranium deposit with other tellurides and selenides.

IMA Status:

Approved IMA 1987

Locality:

Otish Mountains uranium deposit, PQ, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for David H. Watkinson (1937-), Canadian mineralogist.

Synonym:

IMA1985-024

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Watkinsonite Crystallography

Axial Ratios:

a:b:c =3.2326:1:3.75

Cell Dimensions:

a = 12.921, b = 3.997, c = 14.989, Z = 2; beta = 109.2° V = 731.05 Den(Calc)= 7.87

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Pm ?

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

By Intensity(I/I_o): 2.929(1), 2.976(1), 3.573(0.9),

Physical Properties of Watkinsonite

Cleavage:

None

Color:

Black.

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Watkinsonite

RL Anisotrophism:

Moderate, in blue-gray to dark grayish brown.

RL Color:

White with a bluish tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Watkinsonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
420 nm	46.00	46.60
440 nm	46.70	47.20
460 nm	47.30	47.60
480 nm	47.70	48.00
500 nm	47.90	48.30
520 nm	48.10	48.50
540 nm	48.00	48.60
560 nm	47.80	48.70
580 nm	47.80	48.80
600 nm	47.90	48.80
620 nm	47.90	48.90
640 nm	48.00	48.90
660 nm	48.00	49.00
680 nm	47.90	49.00
700 nm	47.90	49.00

**Calculated Relative Intensity Colors of Watkinsonite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Watkinsonite

Electron Density:

r_electron=6.52 gm/cc
note: r_Watkinsonite=7.87 gm/cc.

Fermion Index

Fermion Index = 0.04918
Boson Index = 0.95082

Photoelectric:

PE_Watkinsonite=1,188.91 barns/electron
U=PE_Watkinsonite x r_electron=7,748.84 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Watkinsonite is Not Radioactive

Watkinsonite Classification

Dana Class:

3.7.18.1 (3)Sulfides - Sulfosalts

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

(3.7.18)Dana Group

3.7.18.1 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

Strunz Class:

II/E.34-90 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 Watkinsonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Watkinsonite :
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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Watkinsonite

PbCu2Bi4(Se,S)8
Dana No: 3.7.18.1 Strunz No: II/E.34-90
Locality:

Notes: