Seligmannite Mineral Data

Seligmannite Mineral Data +

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General Seligmannite Information

Chemical Formula:

PbCuAsS3

Composition:

Molecular Weight = 441.87 gm

Copper 14.38 % Cu

Arsenic 16.96 % As

Lead 46.89 % Pb

Sulfur 21.77 % S

______

100.00 %

Empirical Formula:

PbCuAsS₃

Environment:

Forms a series with bournonite.

IMA Status:

Valid Species (Pre-IMA) 1902

Locality:

Lengenbach quarry, Binnental, Valais, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named for Gustav Seligman (1849-1920), German mineral collector.

Synonym:

ICSD 14304

PDF Nov-92

Seligmannite Image

Images:

Click Here for Larger Seligmannite Image

Seligmannite Liveingite

Comments: Black prismatic seligmannite crystals with crystalline black liveingite.
Location: Lengenbach Quarry, Binnental, Valais, Switzerland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Seligmannite

Comments: Lead gray, prismatic seligmannite crystal with brassy yellow pyrite on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2 mm.
© Walter Gabriel

Seligmannite Crystallography

Axial Ratios:

a:b:c =0.9234:1:0.8742

Cell Dimensions:

a = 8.08, b = 8.75, c = 7.65, Z = 4; V = 540.85 Den(Calc)= 5.43

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmmn

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

By Intensity(I/I_o): 2.72(1), 3.85(0.8), 1.749(0.7),

Forms:

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Forms: [ 2 1 0] [ 0 1 0] [ 2 1 1] [ 1 0 1] [ 2 1 2] [ 0 1 1] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Takeuchi Y , Haga N , Zeitschrift fur Kristallographie , 130 (1969) p.254-260, On the crystal structures of seligmannite, PbCuAsS3, and related minerals

View Additional jPOWD Structure files for Seligmannite
[1]

Physical Properties of Seligmannite

Cleavage:

[001] Indistinct, [100] Indistinct, [010] Indistinct

Color:

Lead gray, Dark lead gray, Black.

Density:

5.38 - 5.44, Average = 5.41

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Twinning Common - Crystals are usually twinned.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

chocolate brown

Optical Properties of Seligmannite

RL Anisotrophism:

Strong.

RL Color:

Rose white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Seligmannite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	34.80	33.60
420 nm	34.60	33.60
440 nm	34.40	33.60
460 nm	34.20	33.70
480 nm	33.80	33.80
500 nm	33.40	33.80
520 nm	32.90	33.70
540 nm	32.40	33.60
560 nm	32.00	33.40
580 nm	31.60	33.10
600 nm	31.40	32.70
620 nm	31.00	32.20
640 nm	30.60	31.50
660 nm	30.20	30.90
680 nm	29.70	30.10
700 nm	29.20	29.40

**Calculated Relative Intensity Colors of Seligmannite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R₁
R₂

Calculated Properties of Seligmannite

Electron Density:

r_electron=4.72 gm/cc
note: r_Seligmannite=5.43 gm/cc.

Fermion Index

Fermion Index = 0.10526
Boson Index = 0.89474

Photoelectric:

PE_Seligmannite= 849.17 barns/electron
U=PE_Seligmannite x r_electron=4,007.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Seligmannite is Not Radioactive

Seligmannite Classification

Dana Class:

3.4.3.1 (3)Sulfides - Sulfosalts

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

(3.4.3)Dana Group

3.4.3.1 Seligmannite PbCuAsS3 Pmmn 2/m 2/m 2/m

3.4.3.2 Bournonite PbCuSbS3 Pn21m 2/m 2/m 2/m

3.4.3.3 Soucekite PbCuBi(S,Se)3 Pn21m mm2

Strunz Class:

II/E.16-10 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with As/Sb, x=3,0-2,5

II/E.16 - Seligmannite - Bournonite series

II/E.16-10 Seligmannite PbCuAsS3 Pmmn 2/m 2/m 2/m

II/E.16-20 Bournonite PbCuSbS3 Pn21m 2/m 2/m 2/m

Other Seligmannite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Seligmannite

PbCuAsS3
Dana No: 3.4.3.1 Strunz No: II/E.16-10
Locality:

Notes: