Mineralogy Database

Baumhauerite Mineral Data

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General Baumhauerite Information

Help on Chemical  Formula: Chemical Formula: Pb3As4S9
Help on Composition: Composition: Molecular Weight = 1,209.88 gm
   Arsenic  24.77 %  As
   Lead     51.38 %  Pb
   Sulfur   23.85 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb3As4S9
Help on Environment: Environment: In sugary dolomite (Binntal, Switzerland).
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Binnental, Valais, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Heinrich Adolph Baumhauer (1848-1926), German mineralogist and Professor, University of Fribourg, Switzerland.
Help on Name Pronunciation: Name Pronunciation: Baumhauerite + Pronunciation Say BAUMHAUERITE
Help on Synonym: Synonym: Guitermanite
  ICSD 18123
  IMA1988-061
  PDF 24-1469
 

Baumhauerite Image

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  Baumhauerite

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

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =2.75:1:0.9553
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.149(1), 2.957(0.9), 3.594(0.8),
Help on Forms: Forms:

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Help on Above

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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Physical Properties of Baumhauerite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Lead gray, Steel gray.
Help on Density: Density: 5.33
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: chocolate brown
 

Optical Properties of Baumhauerite

Help on RL Anisotrophism: RL Anisotrophism: Strong, colorful in green, violet, blue-green or yellow.
Help on RL Color: RL Color: White with deep red internal reflections.
Help on Reflectivity 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.60 gm/cc
note: Specific Gravity of Baumhauerite =5.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEBaumhauerite = 933.98 barns/electron
U=PEBaumhauerite x rElectron Density=4,295.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Baumhauerite is Not Radioactive
 

Baumhauerite Classification

Help on  Dana Class: Dana Class: 03.06.13.01 (03)Sulfides - Sulfosalts
  (03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.06.13)Dana Group
 
03.06.13.01 Baumhauerite Pb3As4S9 P1 1
 
03.06.13.02 Baumhauerite-2a! Pb3As4S9 Unk 2/m
Help on  Strunz Class: Strunz Class: 02.HC.05b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HC -With only Pb
 
02.HC.05b Baumhauerite Pb3As4S9 P1 1
 
02.HC.05b Baumhauerite-2a! Pb3As4S9 Unk 2/m
 

Other Baumhauerite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Baumhauerite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Baumhauerite

Pb3As4S9
Dana No: 03.06.13.01 Strunz No: 02.HC.05b
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