Weibullite Mineral Data

General Weibullite Information

Chemical Formula:

Pb6Bi8(S,Se)18

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 %

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

PDF 29-761

Weibullite Image

Images:

Weibullite Nordstromite

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 3.847(1), 3.08(0.9), 3.268(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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Mumme W G , The Canadian Mineralogist , 18 (1980) p.1-12, Weibullite Ag0.32Pb5.09Bi8.55Se6.08S11.92 from Falun, Sweden:, A higher homologue of galenobismutite, Locality: Falun, Sweden

Physical Properties of Weibullite

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

Optical Properties of Weibullite

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

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	∑ 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

Electron Density:

Bulk Density (Electron Density)=5.98 gm/cc
note: Specific Gravity of Weibullite =7.26 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Weibullite=1,524.86 barns/electron
U=PE_Weibullite x rElectron Density=9,121.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Weibullite is Not Radioactive

Weibullite Classification

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

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

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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Ask about Weibullite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Weibullite Specimen Label here :

Weibullite

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

Notes: