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Lengenbachite Mineral Data
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General Lengenbachite Information
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 Chemical Formula: |
Pb6(Ag,Cu)2As4S13 |
| Composition: |
Molecular Weight = 2,140.02 gm |
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Copper 2.38 % Cu |
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Silver 6.05 % Ag |
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Arsenic 14.00 % As |
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Lead 58.09 % Pb |
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Sulfur 19.48 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb6Ag1.2Cu0.8As4S13 |
| Environment: |
Hydrothermal origin. |
| IMA Status: |
Valid Species (Pre-IMA) 1905 |
| Locality: |
Lengenbach quarry, Binnental, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named after its locality. |
| Name Pronunciation: |
Lengenbachite + Pronunciation  |
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Lengenbachite Image |
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Images:
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Images:
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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 |
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Lengenbachite Crystallography
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| Axial Ratios: |
a:b:c =1.5796:1:6.0068 |
| 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 |
| Crystal System: |
Triclinic Space Group: P1 or P1 |
| 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), |
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Physical Properties of Lengenbachite
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| Cleavage: |
{100} Perfect, {h00} Distinct, {hk0} Distinct |
| Color: |
Gray blue, Steel gray. |
| Density: |
5.8 - 5.85, Average = 5.82 |
| Diaphaneity: |
Opaque |
| Fracture: |
Flexible - Flexible fragments. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
1-2 - Between Talc and Gypsum |
| Luster: |
Metallic |
| Streak: |
brownish black |
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Optical Properties of Lengenbachite
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| RL Anisotrophism: |
Weak. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Lengenbachite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
38.90 |
40.00 |
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| 420 nm |
38.50 |
39.80 |
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| 440 nm |
38.20 |
39.40 |
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| 460 nm |
37.60 |
39.00 |
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| 480 nm |
37.30 |
38.70 |
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| 500 nm |
36.80 |
38.30 |
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| 520 nm |
36.30 |
37.90 |
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| 540 nm |
35.90 |
37.40 |
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| 560 nm |
35.50 |
36.90 |
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| 580 nm |
35.30 |
36.50 |
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| 600 nm |
35.10 |
36.10 |
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| 620 nm |
34.70 |
35.70 |
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| 640 nm |
34.20 |
35.20 |
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| 660 nm |
33.50 |
34.40 |
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| 680 nm |
32.80 |
33.70 |
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| 700 nm |
32.00 |
32.90 |
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Calculated Relative Intensity Colors of Lengenbachite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
260% |
| R1 |
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| R2 |
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Calculated Properties of Lengenbachite
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| Electron Density: |
Bulk Density (Electron Density)=6.01 gm/cc
note: Specific Gravity of Lengenbachite =7.05 gm/cc.
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| Fermion Index: |
Fermion Index = 0.12
Boson Index = 0.88 |
| Photoelectric: |
PELengenbachite =1,075.90 barns/electron
U=PELengenbachite x rElectron Density=6,462.18 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lengenbachite is Not Radioactive |
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Lengenbachite Classification
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| Dana Class: |
03.03.07.01 (03)Sulfides - Sulfosalts |
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(03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.03.07)Dana Group |
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03.03.07.01 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri |
| Strunz Class: |
02.HF.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HF -With SnS and PbS archetype structure units |
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02.HF.30 Lengenbachite Pb6(Ag,Cu)2As4S13 P1 or P1 Tri |
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Other Lengenbachite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(AntBidBlaNic1) OPTIC PROP.(AntBidBlaNic1) |
| 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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