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Falkmanite Mineral Data

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General Falkmanite Information

Help on Chemical  Formula: Chemical Formula: Pb5Sb4S11
Help on Composition: Composition: Molecular Weight = 1,842.83 gm
   Antimony  25.77 %  Sb
   Lead      55.09 %  Pb
   Sulfur    19.14 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Pb4.9Sb3.9S11
Help on Environment: Environment: Similar to boulangerite. New data from synthetic material suggests meneghinite is closer in structure.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA)
Help on Locality: Locality: Bayerland mine, Pfaffenreuth, Bayern (Bavaria), Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for O.C.A. Falkman.
Help on Name Pronunciation: Name Pronunciation: Falkmanite + Pronunciation Say FALKMANITE
 

Falkmanite Image

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  Falkmanite

Comments: Metallic black platy striated falkmanite, with bronze luster in spots.
Location: Grube Bayerland, Waldsassen, Bavaria, Bayern, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Falkmanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.7458:1:1.4485
Help on Cell Dimensions: Cell Dimensions: a = 21.626, b = 7.876, c = 11.409, Z = 4; beta = 96.12° V = 1,932.18 Den(Calc)= 6.33
Help on Crystal System: Crystal System: Monoclinic
Help on X Ray Diffraction: 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

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Lead gray, Pink brown.
Help on Density: Density: 6.31
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Metallic
Help on Streak: Streak: brownish gray
 

Optical Properties of Falkmanite

Help on Optical Data: Optical Data:
 

Calculated Properties of Falkmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.34 gm/cc
note: Specific Gravity of Falkmanite =6.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEFalkmanite =1,094.38 barns/electron
U=PEFalkmanite x rElectron Density=5,839.40 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Falkmanite is Not Radioactive
 

Falkmanite Classification

Help on  Dana Class: Dana Class: 03.05.02.02 (03)Sulfides - Sulfosalts
  (03.05)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.05.02)Dana Group
 
03.05.02.01 Boulangerite Pb5Sb4S11 Unk Ortho
 
03.05.02.02 Falkmanite Pb5Sb4S11 Mono
Help on  Strunz Class: Strunz Class: 02.HC.15 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.15 Boulangerite Pb5Sb4S11 Unk Ortho
 
02.HC.15 Falkmanite Pb5Sb4S11 Mono
 
02.HC.15 Plumosite* Pb2Sb2S5 Mono
 

Other Falkmanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(EurJMin, v 13, p 411)
Help on See Also: 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 :

Falkmanite

Pb5Sb4S11
Dana No: 03.05.02.02 Strunz No: 02.HC.15
Locality:

 

Notes:

 

 
   
 


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