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Weibullite Mineral Data
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General Weibullite Information
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 Chemical Formula: |
Pb6Bi8(S,Se)18 |
| Composition: |
Molecular Weight = 3,679.81 gm |
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Bismuth 45.43 % Bi |
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Lead 33.78 % Pb |
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Selenium 8.58 % Se |
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Sulfur 12.20 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb6Bi8S14Se4 |
| Environment: |
Intimately intergrown with laitakarite and bismuthinite in a hornblende rock. |
| IMA Status: |
Valid Species (Pre-IMA) 1910 |
| Locality: |
Falun, Sweden. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Mats Weibull (1856-1923), Swedish mineralogist. |
| Name Pronunciation: |
Weibullite + Pronunciation  |
| Synonym: |
ICSD 60147 |
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PDF 29-761 |
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Weibullite Image |
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Images:
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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 |
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Weibullite Crystallography
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| Axial Ratios: |
a:b:c =3.7831:1:13.2251 |
| Cell Dimensions: |
a = 15.39, b = 4.068, c = 53.8, Z = 4; V = 3,368.23 Den(Calc)= 7.26 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 3.847(1), 3.08(0.9), 3.268(0.8), |
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Physical Properties of Weibullite
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| Cleavage: |
{???} Good |
| Color: |
Steel gray. |
| Density: |
6.97 - 7.145, Average = 7.05 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
| Streak: |
dark gray |
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Optical Properties of Weibullite
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| 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
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| RL Anisotrophism: |
Strong, dark gray red-brown. |
| RL Color: |
White. |
| RL Pleochroism: |
Weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Weibullite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.60 |
51.50 |
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| 420 nm |
43.00 |
51.00 |
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| 440 nm |
42.40 |
50.50 |
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| 460 nm |
41.80 |
49.30 |
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| 480 nm |
41.40 |
48.40 |
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| 500 nm |
40.90 |
47.80 |
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| 520 nm |
40.50 |
47.40 |
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| 540 nm |
40.00 |
46.60 |
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| 560 nm |
39.50 |
45.90 |
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| 580 nm |
38.90 |
45.10 |
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| 600 nm |
38.40 |
44.40 |
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| 620 nm |
38.00 |
43.90 |
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| 640 nm |
37.50 |
43.30 |
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| 660 nm |
37.00 |
42.80 |
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| 680 nm |
36.70 |
42.50 |
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| 700 nm |
36.40 |
42.20 |
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Calculated Relative Intensity Colors of Weibullite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R1 |
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| R2 |
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Calculated Properties of Weibullite
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| Electron Density: |
Bulk Density (Electron Density)=5.98 gm/cc
note: Specific Gravity of Weibullite =7.26 gm/cc.
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| Fermion Index: |
Fermion Index = 0.08
Boson Index = 0.92 |
| Photoelectric: |
PEWeibullite =1,524.86 barns/electron
U=PEWeibullite x rElectron Density=9,121.62 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weibullite is Not Radioactive |
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Weibullite Classification
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| Dana Class: |
03.06.18.01 (03)Sulfides - Sulfosalts |
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(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.06.18)Dana Group |
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03.06.18.01 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m |
| Strunz Class: |
02.JB.45 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.J - Sulfosalts of PbS Archetype |
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02.JB -Galena derivatives, with Pb |
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02.JB.45 Galenobismutite PbBi2S4 Pnam 2/m 2/m 2/m |
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02.JB.45 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m |
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02.JB.45 Angelaite! Cu2AgPbBiS4 P 21/n 2/m |
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Other Weibullite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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