Mineralogy Database

Sylvanite Mineral Data

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General Sylvanite Information

Help on Chemical  Formula: Chemical Formula: (Au,Ag)2Te4
Help on Composition: Composition: Molecular Weight = 429.89 gm
   Silver      6.27 %  Ag
   Tellurium  59.36 %  Te
   Gold       34.36 %  Au
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Au0.75Ag0.25Te2
Help on Environment: Environment: Most commonly in low-temperature hydrothermal veins; also in moderate temperature and high-temperature deposits, usually among the last minerals formed.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1835
Help on Locality: Locality: Baia de Aries (Aranyosb�nya, Offenb�nya), Transylvania, Romania. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after TranSYLVANia, for the part of Romainia where it was first found..
Help on Name Pronunciation: Name Pronunciation: Sylvanite + Pronunciation Say SYLVANITE
Help on Synonym: Synonym: ICSD 30874
  PDF 9-477
 

Sylvanite Image

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  Sylvanite

Comments: Flat-lying, metallic crystallized sylvanite on a quartz rich matrix. Caleb Simkoff Collection.
Location: Sacaramb (Nagyag), Transylvania, Romania. Scale: 7.5 x 8.5 x 4 cm.
© Dan Weinrich

Sylvanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.9955:1:3.2561
Help on Cell Dimensions: Cell Dimensions: a = 8.96, b = 4.49, c = 14.62, Z = 4; beta = 145.433° V = 333.71 Den(Calc)= 8.56
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.05(1), 2.14(0.5), 2.25(0.3),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 0 1 0) ( 1 1 0) ( 3 0 1) ( 1 0 0) ( 1 0 1) ( 1 0 3)

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Physical Properties of Sylvanite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Yellowish silver white, White.
Help on Density: Density: 7.9 - 8.3, Average = 8.1
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Skeletal - Crystals form crude outlines with missing faces.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Metallic
Help on Magnetism: Magnetism: Magnetic after heating
Help on Streak: Streak: steel gray
 

Optical Properties of Sylvanite

Help on RL Anisotrophism: RL Anisotrophism: Very strong, in grayish brown, grayish white, and yellowish and bluish tints.
Help on RL Color: RL Color: Creamy white.
Help on RL Pleochroism: RL Pleochroism: Strong, cream-white to leather brown.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Sylvanite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   38.60   52.60 
   
 420 nm   41.40   54.80 
 440 nm   44.20   57.00 
 460 nm   46.40   58.50 
 480 nm   47.90   59.60 
 500 nm   49.00   60.30 
 520 nm   50.00   60.80 
 540 nm   50.60   61.10 
 560 nm   50.80   61.40 
 580 nm   51.00   61.60 
 600 nm   51.30   61.70 
 620 nm   51.60   61.90 
 640 nm   52.00   62.00 
 660 nm   52.60   62.20 
 680 nm   53.50   62.50 
 700 nm   54.80   63.10 
Calculated Relative Intensity Colors of Sylvanite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 200%
R1                  
R2                  
 

Calculated Properties of Sylvanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.97 gm/cc
note: Specific Gravity of Sylvanite =8.56 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PESylvanite = 815.38 barns/electron
U=PESylvanite x rElectron Density=5,682.52 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sylvanite is Not Radioactive
 

Sylvanite Classification

Help on  Dana Class: Dana Class: 02.12.13.03 (02)Sulfides - Including Selenides and Tellurides
  (02.12)where Am Bn Xp, with (m+n):p=1:2
  (02.12.13)Krennerite Group
 
02.12.13.01 Krennerite AuTe2 Pma2 mm2
 
02.12.13.02 Calaverite AuTe2 C 2/m 2/m
 
02.12.13.03 Sylvanite (Au,Ag)2Te4 P 2/c 2/m
 
02.12.13.04 Kostovite CuAuTe4 Pma2 mm2
Help on  Strunz Class: Strunz Class: 02.EA.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.E - Metal Sulfides, M:S � 1:2
  02.EA -M:S = 1:2
 
02.EA.05 Sylvanite (Au,Ag)2Te4 P 2/c 2/m
 

Other Sylvanite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Sylvanite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - Philatelic Mineralogy
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Sylvanite

(Au,Ag)2Te4
Dana No: 02.12.13.03 Strunz No: 02.EA.05
Locality:

 

Notes:

 

 
   
 


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