Mineralogy Database

Watkinsonite Mineral Data

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General Watkinsonite Information

Help on Chemical  Formula: Chemical Formula: PbCu2Bi4(Se,S)8
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: PbCu2Bi4Se6.5S1.5
Help on Environment: Environment: In a vein-type uranium deposit with other tellurides and selenides.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Otish Mountains uranium deposit, PQ, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for David H. Watkinson (1937-), Canadian mineralogist.
Help on Name Pronunciation: Name Pronunciation: Watkinsonite + Pronunciation Say WATKINSONITE
Help on Synonym: Synonym: IMA1985-024

Watkinsonite Image

Click Here for Larger   Image in a New Browser Window Images:
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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

Watkinsonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.2326:1:3.75
Help on Cell Dimensions: Cell Dimensions: a = 12.921, b = 3.997, c = 14.989, Z = 2; beta = 109.2° V = 731.05 Den(Calc)= 7.87
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Pm ?
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.929(1), 2.976(1), 3.573(0.9),

Physical Properties of Watkinsonite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Metallic

Optical Properties of Watkinsonite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, in blue-gray to dark grayish brown.
Help on RL Color: RL Color: White with a bluish tint.
Help on Reflectivity 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
   0%   20%   40%   60%   80% 100% 120% 140% 160% 180% 190%

Calculated Properties of Watkinsonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.52 gm/cc
note: Specific Gravity of Watkinsonite =7.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEWatkinsonite =1,188.91 barns/electron
U=PEWatkinsonite x rElectron Density=7,748.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Watkinsonite is Not Radioactive

Watkinsonite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.18)Dana Group Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m
Help on  Strunz Class: Strunz Class: 02.HB.20e 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HB -With Cu, Ag, Hg, Fe, Sn and Pb
02.HB.20e Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

Other Watkinsonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 02.HB.20e





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