Mineralogy Database

Fischesserite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Fischesserite + Pronunciation Say FISCHESSERITE
Help on Synonym: Synonym: ICSD 15734
  PDF 25-367

Fischesserite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Fischesserite   Klockmannite

Comments: Pinkish-grey fischesserite (Fl) with fine-grained bluish-grey klockmannite (Kl) and grey clausthalite (Cl). Polished section from microprobe analysis in reflected light, parallel nicols.
Location: Predborice, Bohemia, Czech Republic. Scale: Picture size 0.7 mm.
© Thomas Witzke

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 - Gyroidal H-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),

Physical Properties of Fischesserite

Help on Cleavage: Cleavage: None
Help on Color: Color: Silver white.
Help on Density: Density: 9.05
Help on Diaphaneity: Diaphaneity: 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
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%

Calculated Properties of Fischesserite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.73 gm/cc
note: Specific Gravity of Fischesserite =9.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFischesserite = 612.47 barns/electron
U=PEFischesserite x rElectron Density=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: (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.03)Uytenbogaardtite Group Uytenbogaardtite Ag3AuS2 P 4122 4 2 2 Fischesserite Ag3AuSe2 I 4132 4 3 2 Petzite Ag3AuTe2 I 4132 4 3 2
Help on  Strunz Class: Strunz Class: 02.BA.40a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BA -With Cu, Ag, Au
02.BA.40a Fischesserite Ag3AuSe2 I 4132 4 3 2
02.BA.40a Petzite Ag3AuTe2 I 4132 4 3 2

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 - 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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Dana No: Strunz No: 02.BA.40a





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