Bournonite Mineral Data

General Bournonite Information

Chemical Formula:

PbCuSbS3

Composition:

Molecular Weight = 488.69 gm

Copper 13.00 % Cu

Antimony 24.91 % Sb

Lead 42.40 % Pb

Sulfur 19.68 % S

______

100.00 %

Empirical Formula:

PbCuSbS₃

Environment:

Moderate temperature hydrothermal veins.

IMA Status:

Valid Species (Pre-IMA) 1805

Locality:

Wheal Boys, St Endellion, Cornwall, England Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist, J. L. de Bournon (1751-1825).

Name Pronunciation:

Bournonite + Pronunciation

Synonym:

Endellionite

ICSD 14303

PDF 42-1407

Wheel Ore

Bournonite Image

Images:

Bournonite

Comments: Lustrous, silvery crystals of bournonite on massive bournonite.
Location: Mercedes Mine, Huanuco Dept., Peru. Scale: 3x3x2.7 cm.
© Isaias Casanova / IC Minerals

Images:

Bournonite

Comments: Bright, blocky crystalline aggregate of steel gray bournonite crystals.
Location: Yao-gan-xian mine, Hunan China. Scale: Picture size 2 cm.
© Fabre Minerals

Bournonite Crystallography

Axial Ratios:

a:b:c =0.9379:1:0.8965

Cell Dimensions:

a = 8.16, b = 8.7, c = 7.8, Z = 2; V = 553.74 Den(Calc)= 2.93

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pn21m

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

By Intensity(I/I_o): 2.74(1), 1.768(0.5), 2.685(0.45),

Forms:

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Forms: ( 0 1 0) ( 0 1 1) ( 1 0 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Bournonite

Cleavage:

{010} Imperfect

Color:

Gray, Black, Steel gray.

Density:

5.7 - 5.9, Average = 5.8

Diaphaneity:

Opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Cog-wheel - Generally six sided twinned crystals forming Cog-Wheel shapes

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Cubic - Crystals show a cubic outline.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

gray

Optical Properties of Bournonite

RL Anisotrophism:

Weak in air.

RL Pleochroism:

Very weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Bournonite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	37.30	37.00
420 nm	37.40	37.70
440 nm	37.50	38.40
460 nm	36.90	38.00
480 nm	36.20	37.40
500 nm	35.60	37.00
520 nm	35.00	36.60
540 nm	34.50	36.30
560 nm	34.00	36.00
580 nm	33.60	35.50
600 nm	33.00	34.90
620 nm	32.60	34.20
640 nm	32.20	33.50
660 nm	31.80	32.90
680 nm	31.40	32.40
700 nm	31.20	32.00

**Calculated Relative Intensity Colors of Bournonite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%
R₁
R₂

Calculated Properties of Bournonite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Bournonite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Bournonite= 850.10 barns/electron
U=PE_Bournonite x rElectron Density=2,140.67 barns/cc.

Radioactivity:

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

Bournonite Classification

Dana Class:

03.04.03.02 (03)Sulfides - Sulfosalts

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

(03.04.03)Seligmannite Group

03.04.03.01 Seligmannite PbCuAsS3 Pmmn 2/m 2/m 2/m

03.04.03.02 Bournonite PbCuSbS3 Pn21m 2/m 2/m 2/m

03.04.03.03 Soucekite PbCuBi(S,Se)3 Pn21m mm2

Strunz Class:

02.GA.50 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GA -Neso-sulfarsenites, etc., without additional S

02.GA.50 Bournonite PbCuSbS3 Pn21m 2/m 2/m 2/m

02.GA.50 Seligmannite PbCuAsS3 Pmmn 2/m 2/m 2/m

02.GA.50 Soucekite PbCuBi(S,Se)3 Pn21m mm2

Other Bournonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

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

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

Bournonite

PbCuSbS3
Dana No: 03.04.03.02 Strunz No: 02.GA.50
Locality:

Notes:

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