Boulangerite Mineral Data

Boulangerite Mineral Data +

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General Boulangerite Information

Chemical Formula:

Pb5Sb4S11

Composition:

Molecular Weight = 1,887.90 gm

Antimony 26.44 % Sb

Lead 54.88 % Pb

Sulfur 18.68 % S

______

100.00 %

Empirical Formula:

Pb₅Sb_4.1S₁₁

Environment:

Low to moderate temperature hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1837

Locality:

Molières, Gard, Languedoc-Roussillon, France Link to MinDat.org Location Data.

Name Origin:

Named after the French mining engineer, C. L. Boulanger (1810-1849). Later name from an occurrence near Mullan, Idaho.

Synonym:

Mullanite

Boulangerite Image

Images:

Boulangerite

Comments: Specimen of sulfide rich matrix with a surface coated with hair-like crystals of boulangerite.
Location: Noche Buena Mine, Zacatecas, Mexico. Scale: 9 x 6.5 cm.
© John Veevaert

Boulangerite Crystallography

Axial Ratios:

a:b:c =1.5315:1:0.2126

Cell Dimensions:

a = 32.443, b = 21.183, c = 4.505, Z = 6; V = 3,096.02 Den(Calc)= 6.08

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 3.731(1), 3.218(0.45), 3.025(0.4),

Forms:

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Forms: [ 1 3 0] [ 0 1 0] [ 0 3 1] [ 1 0 0] [ 1 1 0]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

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Born L , Hellner E , American Mineralogist , 45 (1960) p.1266-1271, A structural proposal for boulangerite

View Additional jPOWD Structure files for Boulangerite
[1]

Physical Properties of Boulangerite

Cleavage:

[001] Indistinct, [010] Indistinct

Color:

Lead gray, Blue gray, Gray.

Density:

5.7 - 6.3, Average = 6

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Hardness:

2.5 - Finger Nail

Luminescence:

None.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

reddish brown

Optical Properties of Boulangerite

RL Anisotrophism:

Distinct.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Boulangerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	41.20	42.80
420 nm	40.30	42.40
440 nm	39.40	42.00
460 nm	39.20	41.90
480 nm	38.50	40.40
500 nm	37.40	39.30
520 nm	37.90	40.10
540 nm	38.00	40.30
560 nm	37.80	40.20
580 nm	37.40	39.90
600 nm	37.10	39.60
620 nm	36.90	39.50
640 nm	36.60	39.10
660 nm	36.10	38.60
680 nm	35.50	37.90
700 nm	35.00	37.10

**Calculated Relative Intensity Colors of Boulangerite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%
R₁
R₂

Calculated Properties of Boulangerite

Electron Density:

r_electron=5.12 gm/cc
note: r_Boulangerite=6.08 gm/cc.

Fermion Index

Fermion Index = 0.12267
Boson Index = 0.87733

Photoelectric:

PE_Boulangerite=1,093.55 barns/electron
U=PE_Boulangerite x r_electron=5,600.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Boulangerite is Not Radioactive

Boulangerite Classification

Dana Class:

3.5.2.1 (3)Sulfides - Sulfosalts

(3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.5.2)Dana Group

3.5.2.1 Boulangerite Pb5Sb4S11 Unk Ortho

3.5.2.2 Falkmanite Pb5Sb4S11 Mono

Strunz Class:

II/E.19-30 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with predominant Antimon x = 3.0 - 1.9

II/E.19 - Falkmanite - Jaskolskiite series

II/E.19-10 Falkmanite Pb5Sb4S11 Mono

II/E.19-20 Ardaite Pb19Sb13S35Cl7 Unk Mono

II/E.19-30 Boulangerite Pb5Sb4S11 Unk Ortho

II/E.19-40 Plumosite* Pb2Sb2S5 Mono

II/E.19-42 Moeloite! Pb6Sb6S14(S3) P 2₁221 2 2 2

II/E.19-45 Pillaite! Pb9Sb10S23ClO0.5 C 2/m 2/m

II/E.19-50 Jaskolskiite Pb2xCux(Sb,Bi)2-xS5,x=0.2 Pbnm 2/m 2/m 2/m

Other Boulangerite Information

References:

NAME( Ford32) PHYS. PROP.(EurJMin, v 13, p 411) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Boulangerite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - HyperPhysics
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery
18 - WWW-MINCRYST

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Boulangerite

Pb5Sb4S11
Dana No: 3.5.2.1 Strunz No: II/E.19-30
Locality:

Notes: