Mineralogy Database

Petzite Mineral Data

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General Petzite Information

Help on Chemical  Formula: Chemical Formula: Ag3AuTe2
Help on Composition: Composition: Molecular Weight = 775.77 gm
   Silver     41.71 %  Ag
   Tellurium  32.90 %  Te
   Gold       25.39 %  Au
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ag3AuTe2
Help on Environment: Environment: With other tellurides in vein-controlled gold deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1845
Help on Locality: Locality: Sacar�mb (Nagy�g, Szekerembe), Transylvania, Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the chemist, W. Petz.
Help on Name Pronunciation: Name Pronunciation: Petzite Say PETZITE
Help on Synonym: Synonym: ICSD 41772
  Kurilite - hessite or petzite (?)
  PDF 44-1420
 

Petzite Image

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  Petzite   Gold

Comments: Dark, stubby petzite crystals with native gold on quartz.
Location: Rosia Montana (Verespatak), Transylvania, Romania. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Petzite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.38, Z = 8; V = 1,118.39 Den(Calc)= 9.21
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): 2.77(1), 2.12(0.8), 2.03(0.7),
 

Physical Properties of Petzite

Help on Cleavage: Cleavage: None
Help on Color: Color: Iron black, Steel gray.
Help on Density: Density: 8.7 - 9.14, Average = 8.92
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: grayish black
 

Optical Properties of Petzite

Help on RL Anisotrophism: RL Anisotrophism: Noticeable in part.
Help on RL Color: RL Color: Grayish white with a bale bluish tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Petzite in Air
λ R  ∑ R(λ) 
 400 nm   45.40   
 420 nm   43.60 
 440 nm   41.80 
 460 nm   40.70 
 480 nm   39.80 
 500 nm   39.20 
 520 nm   38.60 
 540 nm   38.20 
 560 nm   37.90 
 580 nm   37.60 
 600 nm   37.40 
 620 nm   37.30 
 640 nm   37.10 
 660 nm   37.00 
 680 nm   36.90 
 700 nm   36.90 
Calculated Relative Intensity Colors of Petzite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240%
R                    
 

Calculated Properties of Petzite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.69 gm/cc
note: Specific Gravity of Petzite =9.21 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPetzite = 648.10 barns/electron
U=PEPetzite x rElectron Density=4,985.92 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Petzite is Not Radioactive
 

Petzite Classification

Help on  Dana Class: Dana Class: 02.04.03.03 (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.03)Uytenbogaardtite Group
 
02.04.03.01 Uytenbogaardtite Ag3AuS2 P 4122 4 2 2
 
02.04.03.02 Fischesserite Ag3AuSe2 I 4132 4 3 2
 
02.04.03.03 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 Petzite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Petzite :
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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Petzite Specimen Label here :

Petzite

Ag3AuTe2
Dana No: 02.04.03.03 Strunz No: 02.BA.40a
Locality:

 

Notes:

 

 
   
 


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