Fischesserite Mineral Data

Fischesserite Mineral Data +

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General Fischesserite Information

Chemical Formula:

Ag3AuSe2

Composition:

Molecular Weight = 678.49 gm

Silver 47.69 % Ag

Gold 29.03 % Au

Selenium 23.28 % Se

______

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.

Synonym:

ICSD 15734

PDF 25-367

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Fischesserite Crystallography

Cell Dimensions:

a = 9.967, Z = 8; V = 990.13 Den(Calc)= 9.10

Crystal System:

Isometric - GyroidalH-M Symbol (4 3 2) Space Group: I 4₁32

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.662(1), 2.035(0.8), 2.29(0.8),

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

Cleavage:

None

Color:

Silver white.

Density:

9.05

Diaphaniety:

Opaque

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Optical Properties of Fischesserite

RL Bireflectance:

None.

RL Color:

Pink.

RL Pleochroism:

None.

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

Electron Density:

r_electron=7.73 gm/cc
note: r_{Fischesserite}=9.10 gm/cc.

Fermion Index

Fermion Index = 0.01768
Boson Index = 0.98232

Photoelectric:

PE_{Fischesserite}= 612.47 barns/electron
U=PE_{Fischesserite} x r_electron=4,731.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fischesserite is Not Radioactive

Fischesserite Classification

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

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

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 -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: