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Freibergite Mineral Data

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General Freibergite Information

Help on Chemical  Formula: Chemical Formula: (Ag,Cu,Fe)12(Sb,As)4S13
Help on Composition: Composition: Molecular Weight = 1,929.46 gm
   Iron       3.47 %  Fe
   Copper    11.86 %  Cu
   Silver    40.25 %  Ag
   Antimony  18.93 %  Sb
   Arsenic    3.88 %  As
   Sulfur    21.60 %  S
            ______ 
            100.00 % 
Help on Empirical Formula: Empirical Formula: Ag7.2Cu3.6Fe2+1.2Sb3AsS13
Help on Environment: Environment: In hydrothermal deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1853
Help on Locality: Locality: Freiberg district, Saxony. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Freibergite + Pronunciation Say FREIBERGITE
Help on Synonym: Synonym: ICSD 62116
  PDF 27-190
 

Freibergite Image

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  Freibergite

Comments: Dark metallic freibergite in white quartz.
Location: Freiberg, Freiberg District, Erzgebirge, Saxony, Germany. Scale: 35x20x10 mm.
© John Betts - Fine Minerals

Freibergite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.47, Z = 2; V = 1,147.73 Den(Calc)= 5.58
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.05(1), 1.862(0.7), 2.64(0.5),
 

Physical Properties of Freibergite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray, Steel gray, Black.
Help on Density: Density: 4.85 - 5, Average = 4.92
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Metallic
Help on Streak: Streak: reddish black
 

Optical Properties of Freibergite

Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Freibergite in Air
λ R  ∑ R(λ) 
 400 nm   35.20   
 420 nm   35.10 
 440 nm   35.00 
 460 nm   34.70 
 480 nm   34.30 
 500 nm   33.70 
 520 nm   33.10 
 540 nm   32.60 
 560 nm   32.20 
 580 nm   31.80 
 600 nm   31.40 
 620 nm   30.90 
 640 nm   30.50 
 660 nm   30.00 
 680 nm   29.50 
 700 nm   29.00 
Calculated Relative Intensity Colors of Freibergite in Air
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240% 270% 290%
R                        
 

Calculated Properties of Freibergite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Freibergite =5.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0023567094
Boson Index = 0.9976432906
Help on Photoelectric: Photoelectric: PEFreibergite = 174.53 barns/electron
U=PEFreibergite x rElectron Density= 876.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Freibergite is Not Radioactive
 

Freibergite Classification

Help on  Dana Class: Dana Class: 03.03.06.03 (03)Sulfides - Sulfosalts
  (03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.03.06)Tetrahedrite Group (Isometric: I-43m)
 
03.03.06.01 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m
 
03.03.06.02 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m
 
03.03.06.03 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m
 
03.03.06.04 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m
 
03.03.06.05 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m
 
03.03.06.06 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m
 
03.03.06.07 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m
Help on  Strunz Class: Strunz Class: 02.GB.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GB -Neso-sulfarsenites, etc
 
02.GB.05 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m
 
02.GB.05 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m
 
02.GB.05 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m
 
02.GB.05 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m
 
02.GB.05 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m
 
02.GB.05 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m
 
02.GB.05 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m
 

Other Freibergite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Freibergite :
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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Freibergite

(Ag,Cu,Fe)12(Sb,As)4S13
Dana No: 03.03.06.03 Strunz No: 02.GB.05
Locality:

 

Notes:

 

 
   
 


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