Mineralogy Database

Weibullite Mineral Data

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General Weibullite Information

Help on Chemical  Formula: Chemical Formula: Pb6Bi8(S,Se)18
Help on Composition: Composition: Molecular Weight = 3,679.81 gm
   Bismuth   45.43 %  Bi
   Lead      33.78 %  Pb
   Selenium   8.58 %  Se
   Sulfur    12.20 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb6Bi8S14Se4
Help on Environment: Environment: Intimately intergrown with laitakarite and bismuthinite in a hornblende rock.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1910
Help on Locality: Locality: Falun, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mats Weibull (1856-1923), Swedish mineralogist.
Help on Name Pronunciation: Name Pronunciation: Weibullite + Pronunciation Say WEIBULLITE
Help on Synonym: Synonym: ICSD 60147
  PDF 29-761
 

Weibullite Image

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  Nordstromite   Weibullite

Comments: Fibrous, silvery crystals of nordstromite. Lacking a chemical analysis it is possible that the crystal is weibullite instead.
Location: Falu mine, Falun, Sweden. Scale: Crystal Size 1 mm.
© Tom Loomis / Dakota Matrix

Weibullite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.7831:1:13.2251
Help on Cell Dimensions: Cell Dimensions: a = 15.39, b = 4.068, c = 53.8, Z = 4; V = 3,368.23 Den(Calc)= 7.26
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.847(1), 3.08(0.9), 3.268(0.8),
 

Physical Properties of Weibullite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Steel gray.
Help on Density: Density: 6.97 - 7.145, Average = 7.05
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: dark gray
 

Optical Properties of Weibullite

Help on Optical Data: Optical Data: NCalc= 1.91 - from Gladstone-Dale relationship (KC = 0.1259) where Ncalc=Dcalc*KC+1
NCalc= 1.89 - from Gladstone-Dale relationship (KC = 0.1259) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong, dark gray red-brown.
Help on RL Color: RL Color: White.
Help on RL Pleochroism: RL Pleochroism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Weibullite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   43.60   51.50 
   
 420 nm   43.00   51.00 
 440 nm   42.40   50.50 
 460 nm   41.80   49.30 
 480 nm   41.40   48.40 
 500 nm   40.90   47.80 
 520 nm   40.50   47.40 
 540 nm   40.00   46.60 
 560 nm   39.50   45.90 
 580 nm   38.90   45.10 
 600 nm   38.40   44.40 
 620 nm   38.00   43.90 
 640 nm   37.50   43.30 
 660 nm   37.00   42.80 
 680 nm   36.70   42.50 
 700 nm   36.40   42.20 
Calculated Relative Intensity Colors of Weibullite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%
R1                    
R2                    
 

Calculated Properties of Weibullite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.98 gm/cc
note: Specific Gravity of Weibullite =7.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PEWeibullite =1,524.86 barns/electron
U=PEWeibullite x rElectron Density=9,121.62 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weibullite is Not Radioactive
 

Weibullite Classification

Help on  Dana Class: Dana Class: 03.06.18.01 (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.18)Dana Group
 
03.06.18.01 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.JB.45 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.J - Sulfosalts of PbS Archetype
  02.JB -Galena derivatives, with Pb
 
02.JB.45 Galenobismutite PbBi2S4 Pnam 2/m 2/m 2/m
 
02.JB.45 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m
 
02.JB.45 Angelaite! Cu2AgPbBiS4 P 21/n 2/m
 

Other Weibullite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Weibullite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Weibullite

Pb6Bi8(S,Se)18
Dana No: 03.06.18.01 Strunz No: 02.JB.45
Locality:

 

Notes:

 

 
   
 


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