Falkmanite Mineral Data + 
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- 3.5.2.1 Boulangerite Pb5Sb4S11 Unk Ortho
- 3.5.2.2 Falkmanite Pb5Sb4S11 Mono
- II/E.19-10 Falkmanite Pb5Sb4S11 Mono
- II/E.19-20 Ardaite Pb19Sb13S35Cl7 Unk Mono
- II/E.19-30 Boulangerite Pb5Sb4S11 Unk Ortho
- II/E.19-40 Plumosite* Pb2Sb2S5 Mono
- II/E.19-42 Moeloite! Pb6Sb6S14(S3) P 21221 2 2 2
- II/E.19-45 Pillaite! Pb9Sb10S23ClO0.5 C 2/m 2/m
- II/E.19-50 Jaskolskiite Pb2xCux(Sb,Bi)2-xS5,x=0.2 Pbnm 2/m 2/m 2/m
General Falkmanite Information |
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 Chemical Formula: |
Pb5Sb4S11 | ||
| Composition: |
Molecular Weight = 1,842.83 gm | ||
| Antimony 25.77 % Sb | |||
| Lead 55.09 % Pb | |||
| Sulfur 19.14 % S | |||
| ______ | |||
| 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. | ||
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( | ||
Physical Properties of Falkmanite |
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| Cleavage: |
[???] Good | ||
| Color: |
Lead gray, Pink brown. | ||
| Density: |
6.31 | ||
| Diaphaniety: |
Opaque | ||
| Hardness: |
2-3 - Gypsum-Calcite | ||
| Luster: |
Metallic | ||
| Streak: |
brownish gray | ||
Calculated Properties of Falkmanite |
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| Electron Density: |
relectron=5.34 gm/cc |
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| Fermion Index |
Fermion Index = 0.12319 Boson Index = 0.87681 |
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| Photoelectric: |
PEFalkmanite =1,094.38 barns/electron |
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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: |
3.5.2.2 (3)Sulfides - Sulfosalts | ||
| (3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals | |||
| (3.5.2)Dana Group | |||
| Strunz Class: |
II/E.19-10 II - Sulfides and sulphosalts | ||
| II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts with predominant Antimon x = 3.0 - 1.9 | |||
| II/E.19 - Falkmanite - Jaskolskiite series | |||
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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 -École des Mines de Paris Search for Falkmanite using: Visit our Advertisers for Falkmanite : Translate Falkmanite Mineral Data : Ask about Falkmanite here : Print or Cut-and-Paste your Falkmanite Specimen Label here :
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