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Watkinsonite Mineral Data
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General Watkinsonite Information
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 Chemical Formula: |
PbCu2Bi4(Se,S)8 |
| Composition: |
Molecular Weight = 1,731.55 gm |
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Copper 7.34 % Cu |
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Bismuth 48.28 % Bi |
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Lead 11.97 % Pb |
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Selenium 29.64 % Se |
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Sulfur 2.78 % S |
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______ |
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100.00 % |
| Empirical Formula: |
PbCu2Bi4Se6.5S1.5 |
| 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. |
| Name Pronunciation: |
Watkinsonite + Pronunciation  |
| Synonym: |
IMA1985-024 |
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Watkinsonite Image |
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Images:
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Watkinsonite
Comments: BSE image of watkinsonite (W) intergrown with clausthalite (W). (CanMin, v43:899).
Location: Uranium deposit at Niederschlema-Alberoda, Germany.
Scale: See Image.
© Canadian Mineralogist |
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Watkinsonite Crystallography
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| 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 - Domatic H-M Symbol (m) Space Group: Pm ? |
| X Ray Diffraction: |
By Intensity(I/Io): 2.929(1), 2.976(1), 3.573(0.9), |
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Physical Properties of Watkinsonite
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| Cleavage: |
None |
| Color: |
Black. |
| Diaphaneity: |
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 |
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Optical Properties of Watkinsonite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 420 nm |
46.00 |
46.60 |
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| 440 nm |
46.70 |
47.20 |
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| 460 nm |
47.30 |
47.60 |
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| 480 nm |
47.70 |
48.00 |
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| 500 nm |
47.90 |
48.30 |
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| 520 nm |
48.10 |
48.50 |
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| 540 nm |
48.00 |
48.60 |
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| 560 nm |
47.80 |
48.70 |
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| 580 nm |
47.80 |
48.80 |
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| 600 nm |
47.90 |
48.80 |
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| 620 nm |
47.90 |
48.90 |
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| 640 nm |
48.00 |
48.90 |
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| 660 nm |
48.00 |
49.00 |
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| 680 nm |
47.90 |
49.00 |
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| 700 nm |
47.90 |
49.00 |
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Calculated Relative Intensity Colors of Watkinsonite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Properties of Watkinsonite
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| Electron Density: |
Bulk Density (Electron Density)=6.52 gm/cc
note: Specific Gravity of Watkinsonite =7.87 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PEWatkinsonite =1,188.91 barns/electron
U=PEWatkinsonite x rElectron Density=7,748.84 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Watkinsonite is Not Radioactive |
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Watkinsonite Classification
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| Dana Class: |
03.07.18.01 (03)Sulfides - Sulfosalts |
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(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.07.18)Dana Group |
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03.07.18.01 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m |
| Strunz Class: |
02.HB.20e 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HB -With Cu, Ag, Hg, Fe, Sn and Pb |
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02.HB.20e Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m |
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Other Watkinsonite Information
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| 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Print or Cut-and-Paste your Watkinsonite Specimen Label here :
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Watkinsonite
PbCu2Bi4(Se,S)8
Dana No: 03.07.18.01 Strunz No: 02.HB.20e
Locality:
Notes:
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