Baumhauerite Mineral Data

Baumhauerite Mineral Data +

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General Baumhauerite Information

Chemical Formula:

Pb3As4S9

Composition:

Molecular Weight = 1,209.88 gm

Arsenic 24.77 % As

Lead 51.38 % Pb

Sulfur 23.85 % S

______

100.00 %

Empirical Formula:

Pb₃As₄S₉

Environment:

In sugary dolomite (Binntal, Switzerland).

IMA Status:

Approved IMA 1989

Locality:

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

Name Origin:

For Heinrich Adolph Baumhauer (1848-1926), German mineralogist and Professor, University of Fribourg, Switzerland.

Synonym:

Guitermanite

ICSD 18123

IMA1988-061

PDF 24-1469

Baumhauerite Image

Images:

Baumhauerite

Comments: Opaque, lustrous, parallel crystalline baumhauerite aggregates.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Baumhauerite

Comments: Black, rounded, specular baumhauerite crystal on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture width 1 cm.
© Walter Gabriel

Baumhauerite Crystallography

Axial Ratios:

a:b:c =2.75:1:0.9553

Cell Dimensions:

a = 22.905, b = 8.329, c = 7.957, Z = 4; alpha = 90.35°, beta = 97°, gamma = 90.42° V = 1,506.62 Den(Calc)= 5.33

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.149(1), 2.957(0.9), 3.594(0.8),

Forms:

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Forms: [ 4 1 0] [ 0 1 0] [ 3 1 0] [ 0 2 1] [ 1 0 0] [ 1 1 0] [ 1 0 1] [ 2 1 0] [ 0 0 1]

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Crystal Structure:

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Engel P , Nowacki W , Zeitschrift fur Kristallographie , 129 (1969) p.178-202, Die kristallstruktur von baumhauerit, Locality: Lengenbach quarry, Binnatal, Canton Wallis, Switzerland

Physical Properties of Baumhauerite

Cleavage:

[???] Perfect

Color:

Lead gray, Steel gray.

Density:

5.33

Diaphaniety:

Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

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

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

chocolate brown

Optical Properties of Baumhauerite

RL Anisotrophism:

Strong, colorful in green, violet, blue-green or yellow.

RL Color:

White with deep red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Baumhauerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	40.10	43.80
420 nm	39.60	43.50
440 nm	39.10	43.20
460 nm	38.50	42.80
480 nm	38.00	42.30
500 nm	37.40	41.30
520 nm	36.70	41.20
540 nm	36.00	40.50
560 nm	35.30	39.70
580 nm	34.50	38.80
600 nm	33.70	37.80
620 nm	32.90	36.80
640 nm	32.00	35.80
660 nm	31.40	35.00
680 nm	30.80	34.20
700 nm	30.40	33.60

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

Calculated Properties of Baumhauerite

Electron Density:

r_electron=4.60 gm/cc
note: r_Baumhauerite=5.33 gm/cc.

Fermion Index

Fermion Index = 0.11533
Boson Index = 0.88467

Photoelectric:

PE_Baumhauerite= 933.98 barns/electron
U=PE_Baumhauerite x r_electron=4,295.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Baumhauerite is Not Radioactive

Baumhauerite Classification

Dana Class:

3.6.13.1 (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

(3.6.13)Dana Group

3.6.13.1 Baumhauerite Pb3As4S9 P1 1

3.6.13.2 Baumhauerite-2a! Pb3As4S9 Unk 2/m

Strunz Class:

II/E.24-10 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with Arsen and Antimon x = 2.3 - 1.8

II/E.24 - Baumhauerite - Robinsonite series

II/E.24-10 Baumhauerite Pb3As4S9 P1 1

II/E.24-15 Baumhauerite-2a! Pb3As4S9 Unk 2/m

II/E.24-20 Robinsonite Pb4Sb6S13 I2/m 2/m

Other Baumhauerite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Baumhauerite

Pb3As4S9
Dana No: 3.6.13.1 Strunz No: II/E.24-10
Locality:

Notes: