Fischesserite Mineral Data + Say FISCHESSERITE

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General Fischesserite Information

Help on Chemical  Formula: Chemical Formula: Ag3AuSe2
Help on Composition: Composition: Molecular Weight = 678.49 gm
   Silver    47.69 %  Ag
   Gold      29.03 %  Au
   Selenium  23.28 %  Se
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag3AuSe2
Help on Environment: Environment: In carbonate veins in epithermal precious metal deposits.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: From Predborice, Czechoslovakia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Raymond Fischesser, Director of the National School of Mines, Paris, France.
Help on Synonym: Synonym: ICSD 15734
  PDF 25-367
 

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Fischesserite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 9.967, Z = 8; V = 990.13 Den(Calc)= 9.10
Help on Crystal System: Crystal System: Isometric - GyroidalH-M Symbol (4 3 2) Space Group: I 4132
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.662(1), 2.035(0.8), 2.29(0.8),
Click Here for Large Fischesserite Structure Window Crystal Structure:

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Bindi L , Cipriani C , The Canadian Mineralogist , 42 (2004) p.1733-1737, Structural and physical properties of fischesserite,, a rare gold-silver selenide from the De Lamar mine, Owyhee County, Idaho, USA, Locality: De Lamar mine, Owyhee County, Idaho, USA

 

Physical Properties of Fischesserite

Help on Cleavage: Cleavage: None
Help on Color: Color: Silver white.
Help on Density: Density: 9.05
Help on Diaphaniety: Diaphaniety: Opaque
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
 

Optical Properties of Fischesserite

Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Pink.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Fischesserite in Air
λ R  ∑ R(λ) 
 470 nm   32.50   
 548 nm   30.00 
 587 nm   31.10 
 650 nm   33.70 
Calculated Relative Intensity Colors of Fischesserite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%
R                        
 

Calculated Properties of Fischesserite

Help on Electron Density: Electron Density:

relectron=7.73 gm/cc
note: rFischesserite =9.10 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01768
Boson Index = 0.98232
Help on Photoelectric: Photoelectric:

PEFischesserite = 612.47 barns/electron
U=PEFischesserite x relectron=4,731.58 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fischesserite is Not Radioactive

 

Fischesserite Classification

Help on  Dana Class: Dana Class: 2.4.3.2 (2)Sulfides - Including Selenides and Tellurides
  (2.4)where Am Bn Xp, with (m+n):p=2:1
  (2.4.3)Dana Group
 
2.4.3.1 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2
 
2.4.3.2 Fischesserite Ag3AuSe2 I 4132 4 3 2
 
2.4.3.3 Petzite Ag3AuTe2 I 4132 4 3 2
Help on  Strunz Class: Strunz Class: II/B.07-50 II - Sulfides and sulphosalts
  II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold
  II/B.07 - Petrovskaite - Muthmannite series
 
II/B.07-10 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono
 
II/B.07-20 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2
 
II/B.07-30 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m
 
II/B.07-40 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6322 6 2 2
 
II/B.07-50 Fischesserite Ag3AuSe2 I 4132 4 3 2
 
II/B.07-60 Petzite Ag3AuTe2 I 4132 4 3 2
 
II/B.07-70 Muthmannite AgAuTe2 P 2/m Ortho
 

Other Fischesserite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(CanMin 42:1734)
Help on See Also: See Also: Links to other databases for Fischesserite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Fischesserite

Ag3AuSe2
Dana No: 2.4.3.2 Strunz No: II/B.07-50
Locality:

 

Notes:

 

 
   
 
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