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Lengenbachite Mineral Data

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General Lengenbachite Information

Help on Chemical  Formula: Chemical Formula: Pb6(Ag,Cu)2As4S13
Help on Composition: Composition: Molecular Weight = 2,140.02 gm
   Copper    2.38 %  Cu
   Silver    6.05 %  Ag
   Arsenic  14.00 %  As
   Lead     58.09 %  Pb
   Sulfur   19.48 %  S
           ______ 
           100.00 % 
Help on Empirical Formula: Empirical Formula: Pb6Ag1.2Cu0.8As4S13
Help on Environment: Environment: Hydrothermal origin.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1905
Help on Locality: Locality: Lengenbach quarry, Binnental, Valais, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Lengenbachite + Pronunciation Say LENGENBACHITE
 

Lengenbachite Image

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  Lengenbachite

Comments: Shiny, opaque crystalline spray of lengenbachite on white dolomite?.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Lengenbachite

Comments: Metallic gray, thin plates and sheets of lengenbachite in a vug in white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Picture width 1.2 cm.
© Walter Gabriel

Lengenbachite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5796:1:6.0068
Help on Cell Dimensions: Cell Dimensions: a = 18.45, b = 11.68, c = 70.16, Z = 30; alpha = 90°, beta = 91.1°, gamma = 90° V = 15,116.41 Den(Calc)= 7.05
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 2.84(0.9), 4.6(0.3),2.04(0.2), 2.93(0.2), 7.69(0.1), 9.31(0.1),
 

Physical Properties of Lengenbachite

Help on Cleavage: Cleavage: {100} Perfect, {h00} Distinct, {hk0} Distinct
Help on Color: Color: Gray blue, Steel gray.
Help on Density: Density: 5.8 - 5.85, Average = 5.82
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Metallic
Help on Streak: Streak: brownish black
 

Optical Properties of Lengenbachite

Help on RL Anisotrophism: RL Anisotrophism: Weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Lengenbachite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   38.90   40.00 
   
 420 nm   38.50   39.80 
 440 nm   38.20   39.40 
 460 nm   37.60   39.00 
 480 nm   37.30   38.70 
 500 nm   36.80   38.30 
 520 nm   36.30   37.90 
 540 nm   35.90   37.40 
 560 nm   35.50   36.90 
 580 nm   35.30   36.50 
 600 nm   35.10   36.10 
 620 nm   34.70   35.70 
 640 nm   34.20   35.20 
 660 nm   33.50   34.40 
 680 nm   32.80   33.70 
 700 nm   32.00   32.90 
Calculated Relative Intensity Colors of Lengenbachite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 260%
R1                      
R2                      
 

Calculated Properties of Lengenbachite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.01 gm/cc
note: Specific Gravity of Lengenbachite =7.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PELengenbachite =1,075.90 barns/electron
U=PELengenbachite x rElectron Density=6,462.18 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lengenbachite is Not Radioactive
 

Lengenbachite Classification

Help on  Dana Class: Dana Class: 03.03.07.01 (03)Sulfides - Sulfosalts
  (03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.07)Dana Group
 
03.03.07.01 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 02.HF.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HF -With SnS and PbS archetype structure units
 
02.HF.30 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri
 

Other Lengenbachite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Lengenbachite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Lengenbachite

Pb6(Ag,Cu)2As4S13
Dana No: 03.03.07.01 Strunz No: 02.HF.30
Locality:

 

Notes:

 

 
   
 


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