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Fischesserite Mineral Data
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General Fischesserite Information
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 Chemical Formula: |
Ag3AuSe2 |
| Composition: |
Molecular Weight = 678.49 gm |
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Silver 47.69 % Ag |
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Gold 29.03 % Au |
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Selenium 23.28 % Se |
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______ |
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100.00 % |
| Empirical Formula: |
Ag3AuSe2 |
| Environment: |
In carbonate veins in epithermal precious metal deposits. |
| IMA Status: |
Approved IMA 1971 |
| Locality: |
From Predborice, Czechoslovakia. Link to MinDat.org Location Data. |
| Name Origin: |
For Raymond Fischesser, Director of the National School of Mines, Paris, France. |
| Name Pronunciation: |
Fischesserite + Pronunciation  |
| Synonym: |
ICSD 15734 |
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PDF 25-367 |
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Fischesserite Image |
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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 |
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Fischesserite Crystallography
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| Cell Dimensions: |
a = 9.967, Z = 8; V = 990.13 Den(Calc)= 9.10 |
| Crystal System: |
Isometric - Gyroidal H-M Symbol (4 3 2) Space Group: I 4132 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.662(1), 2.035(0.8), 2.29(0.8), |
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Physical Properties of Fischesserite
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| Cleavage: |
None |
| Color: |
Silver white. |
| Density: |
9.05 |
| Diaphaneity: |
Opaque |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Metallic |
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Optical Properties of Fischesserite
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| RL Bireflectance: |
None. |
| RL Color: |
Pink. |
| RL Pleochroism: |
None. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Fischesserite in Air
| λ |
R |
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∑ R(λ) |
| 470 nm |
32.50 |
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| 548 nm |
30.00 |
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| 587 nm |
31.10 |
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| 650 nm |
33.70 |
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Calculated Relative Intensity Colors of Fischesserite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
290% |
| R |
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Calculated Properties of Fischesserite
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| Electron Density: |
Bulk Density (Electron Density)=7.73 gm/cc
note: Specific Gravity of Fischesserite =9.10 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEFischesserite = 612.47 barns/electron
U=PEFischesserite x rElectron Density=4,731.58 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fischesserite is Not Radioactive |
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Fischesserite Classification
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| Dana Class: |
02.04.03.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.03)Uytenbogaardtite Group |
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02.04.03.01 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2 |
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02.04.03.02 Fischesserite Ag3AuSe2 I 4132 4 3 2 |
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02.04.03.03 Petzite Ag3AuTe2 I 4132 4 3 2 |
| Strunz Class: |
02.BA.40a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BA -With Cu, Ag, Au |
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02.BA.40a Fischesserite Ag3AuSe2 I 4132 4 3 2 |
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02.BA.40a Petzite Ag3AuTe2 I 4132 4 3 2 |
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Other Fischesserite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(CanMin 42:1734) |
| 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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Fischesserite
Ag3AuSe2
Dana No: 02.04.03.02 Strunz No: 02.BA.40a
Locality:
Notes:
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