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Falkmanite Mineral Data
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General Falkmanite Information
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 Chemical Formula: |
Pb5Sb4S11 |
| Composition: |
Molecular Weight = 1,842.83 gm |
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Antimony 25.77 % Sb |
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Lead 55.09 % Pb |
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Sulfur 19.14 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb4.9Sb3.9S11 |
| Environment: |
Similar to boulangerite. New data from synthetic material suggests meneghinite is closer in structure. |
| IMA Status: |
Valid Species (Pre-IMA) |
| Locality: |
Bayerland mine, Pfaffenreuth, Bayern (Bavaria), Germany. Link to MinDat.org Location Data. |
| Name Origin: |
Named for O.C.A. Falkman. |
| Name Pronunciation: |
Falkmanite + Pronunciation  |
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Falkmanite Image |
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Images:
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Falkmanite Crystallography
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| Axial Ratios: |
a:b:c =2.7458:1:1.4485 |
| Cell Dimensions: |
a = 21.626, b = 7.876, c = 11.409, Z = 4; beta = 96.12° V = 1,932.18 Den(Calc)= 6.33 |
| Crystal System: |
Monoclinic |
| X Ray Diffraction: |
By Intensity(I/Io): 3.734(1)(312), 2.75(0.6)(603), 1.9(0.53)(340),
1.895(0.51)(334), 3.171(0.49)(122), 3.284(0.48)(512), 3.147(0.43)(222), 3.25( |
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Physical Properties of Falkmanite
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| Cleavage: |
{???} Good |
| Color: |
Lead gray, Pink brown. |
| Density: |
6.31 |
| Diaphaneity: |
Opaque |
| Hardness: |
2-3 - Gypsum-Calcite |
| Luster: |
Metallic |
| Streak: |
brownish gray |
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Optical Properties of Falkmanite
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| Optical Data: |
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Calculated Properties of Falkmanite
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| Electron Density: |
Bulk Density (Electron Density)=5.34 gm/cc
note: Specific Gravity of Falkmanite =6.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.12
Boson Index = 0.88 |
| Photoelectric: |
PEFalkmanite =1,094.38 barns/electron
U=PEFalkmanite x rElectron Density=5,839.40 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Falkmanite is Not Radioactive |
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Falkmanite Classification
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| Dana Class: |
03.05.02.02 (03)Sulfides - Sulfosalts |
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(03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.05.02)Dana Group |
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03.05.02.01 Boulangerite Pb5Sb4S11 Unk Ortho |
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03.05.02.02 Falkmanite Pb5Sb4S11 Mono |
| Strunz Class: |
02.HC.15 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.HC -With only Pb |
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02.HC.15 Boulangerite Pb5Sb4S11 Unk Ortho |
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02.HC.15 Falkmanite Pb5Sb4S11 Mono |
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02.HC.15 Plumosite* Pb2Sb2S5 Mono |
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Other Falkmanite Information
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| References: |
NAME( Dana8) PHYS. PROP.(EurJMin, v 13, p 411) |
| See Also: |
Links to other databases for Falkmanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
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Print or Cut-and-Paste your Falkmanite Specimen Label here :
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Falkmanite
Pb5Sb4S11
Dana No: 03.05.02.02 Strunz No: 02.HC.15
Locality:
Notes:
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