Weibullite Mineral Data

Weibullite Mineral Data +

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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.

Synonym:

ICSD 60147

PDF 29-761

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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:

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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

Diaphaniety:

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:

r_electron=5.98 gm/cc
note: r_Weibullite=7.26 gm/cc.

Fermion Index

Fermion Index = 0.0821
Boson Index = 0.9179

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Weibullite is Not Radioactive

Weibullite Classification

Dana Class:

3.6.18.1 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.18)Dana Group

3.6.18.1 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m

Strunz Class:

II/E.34-30 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.34 - Cosalite - Galenobismuthite

II/E.34-08 Mozgovaite! PbBi4(S,Se)7 Bbmm 2/m 2/m 2/m

II/E.34-10 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m

II/E.34-20 Proudite (Pb,Cu)8Bi9-10(S,Se)22 C 2/m 2/m

II/E.34-30 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m

II/E.34-60 Cannizzarite Pb4Bi6S13 C 2/m 2/m

II/E.34-65 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m

II/E.34-70 Nordstromite Pb3CuBi7(S10Se4) P 2₁/m 2/m

II/E.34-80 Junoite Pb3Cu2Bi8(S,Se)16 C 2/m 2/m

II/E.34-85 Felbertalite! Cu2Pb6Bi8S19 C 2/m 2/m

II/E.34-90 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

II/E.34-100 Paderaite AgPb2Cu6Bi11S22 P 2₁/m 2/m

II/E.34-110 Galenobismutite PbBi2S4 Pnam 2/m 2/m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Weibullite

Pb6Bi8(S,Se)18
Dana No: 3.6.18.1 Strunz No: II/E.34-30
Locality:

Notes: