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Freibergite Mineral Data
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General Freibergite Information
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 Chemical Formula: |
(Ag,Cu,Fe)12(Sb,As)4S13 |
| Composition: |
Molecular Weight = 1,929.46 gm |
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Iron 3.47 % Fe |
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Copper 11.86 % Cu |
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Silver 40.25 % Ag |
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Antimony 18.93 % Sb |
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Arsenic 3.88 % As |
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Sulfur 21.60 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Ag7.2Cu3.6Fe2+1.2Sb3AsS13 |
| Environment: |
In hydrothermal deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1853 |
| Locality: |
Freiberg district, Saxony. Link to MinDat.org Location Data. |
| Name Origin: |
Named after its locality. |
| Name Pronunciation: |
Freibergite + Pronunciation  |
| Synonym: |
ICSD 62116 |
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PDF 27-190 |
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Freibergite Image |
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Images:
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Freibergite Crystallography
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| Cell Dimensions: |
a = 10.47, Z = 2; V = 1,147.73 Den(Calc)= 5.58 |
| Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.05(1), 1.862(0.7), 2.64(0.5), |
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Physical Properties of Freibergite
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| Cleavage: |
None |
| Color: |
Gray, Steel gray, Black. |
| Density: |
4.85 - 5, Average = 4.92 |
| Diaphaneity: |
Opaque |
| Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
| Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
| Streak: |
reddish black |
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Optical Properties of Freibergite
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| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Freibergite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
35.20 |
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| 420 nm |
35.10 |
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| 440 nm |
35.00 |
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| 460 nm |
34.70 |
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| 480 nm |
34.30 |
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| 500 nm |
33.70 |
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| 520 nm |
33.10 |
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| 540 nm |
32.60 |
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| 560 nm |
32.20 |
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| 580 nm |
31.80 |
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| 600 nm |
31.40 |
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| 620 nm |
30.90 |
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| 640 nm |
30.50 |
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| 660 nm |
30.00 |
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| 680 nm |
29.50 |
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| 700 nm |
29.00 |
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Calculated Relative Intensity Colors of Freibergite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
290% |
| R |
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Calculated Properties of Freibergite
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| Electron Density: |
Bulk Density (Electron Density)=5.02 gm/cc
note: Specific Gravity of Freibergite =5.58 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0023567094
Boson Index = 0.9976432906 |
| Photoelectric: |
PEFreibergite = 174.53 barns/electron
U=PEFreibergite x rElectron Density= 876.24 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Freibergite is Not Radioactive |
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Freibergite Classification
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| Dana Class: |
03.03.06.03 (03)Sulfides - Sulfosalts |
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(03.03)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.03.06)Tetrahedrite Group (Isometric: I-43m) |
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03.03.06.01 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m |
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03.03.06.02 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m |
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03.03.06.03 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m |
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03.03.06.04 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m |
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03.03.06.05 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m |
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03.03.06.06 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m |
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03.03.06.07 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m |
| Strunz Class: |
02.GB.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.G - Sulfarsenites, sulfantimonites, sulfbismuthites |
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02.GB -Neso-sulfarsenites, etc |
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02.GB.05 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m |
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02.GB.05 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m |
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02.GB.05 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m |
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02.GB.05 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m |
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02.GB.05 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m |
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02.GB.05 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m |
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02.GB.05 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m |
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Other Freibergite Information
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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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