General Goldfieldite Information
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Chemical Formula: |
Cu12(Te,Sb,As)4S13 |
Composition: |
Molecular Weight = 1,665.23 gm |
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Copper 45.79 % Cu |
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Antimony 4.39 % Sb |
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Tellurium 22.99 % Te |
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Arsenic 1.80 % As |
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Sulfur 25.03 % S |
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______ |
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100.00 % |
Empirical Formula: |
Cu12Te3Sb0.6As0.4S13 |
Environment: |
Occures in epithermal precious metal veins. |
IMA Status: |
Valid Species (Pre-IMA) 1909 |
Locality: |
Mohawk mine, Goldfield, Esmeralda County., Nevada, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality. |
Synonym: |
ICSD 83000 |
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PDF 29-531 |
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Goldfieldite Image |
Images:
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Goldfieldite Crystallography
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Cell Dimensions: |
a = 10.304, Z = 2; V = 1,094.00 Den(Calc)= 5.05 |
Crystal System: |
Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: I 43m |
X Ray Diffraction: |
By Intensity(I/Io): 2.97(1), 1.82(0.6), 1.55(0.3),3.64(0.3), 2.43(0.2), 2.58(0.2), 2.77(0.1), |
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Physical Properties of Goldfieldite
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Cleavage: |
None |
Color: |
Dark lead gray, Iron black. |
Density: |
4.95 |
Diaphaniety: |
Opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
Hardness: |
3-3.5 - Calcite-Copper Penny |
Luminescence: |
Non-fluorescent. |
Luster: |
Metallic |
Magnetism: |
Nonmagnetic |
Streak: |
black |
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Optical Properties of Goldfieldite
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Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Goldfieldite in Air
| λ |
R |
 |
∑ R(λ) |
| 400 nm |
31.10 |
 |
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| 420 nm |
30.80 |
 |
| 440 nm |
30.50 |
 |
| 460 nm |
30.50 |
 |
| 480 nm |
30.20 |
 |
| 500 nm |
30.10 |
 |
| 520 nm |
30.10 |
 |
| 540 nm |
30.10 |
 |
| 560 nm |
30.20 |
 |
| 580 nm |
30.20 |
 |
| 600 nm |
30.30 |
 |
| 620 nm |
30.50 |
 |
| 640 nm |
30.80 |
 |
| 660 nm |
30.90 |
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| 680 nm |
31.00 |
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| 700 nm |
31.10 |
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Calculated Relative Intensity Colors of Goldfieldite in Air
Relative Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
290% |
| R |
|
|
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|
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Calculated Properties of Goldfieldite
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Electron Density: |
relectron=4.58 gm/cc note: rGoldfieldite =5.05 gm/cc. |
Fermion Index |
Fermion Index = 0.02024 Boson Index = 0.97976 |
Photoelectric: |
PEGoldfieldite = 115.82 barns/electron U=PEGoldfieldite x relectron= 530.92 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Goldfieldite is Not Radioactive |
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Goldfieldite Classification
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Dana Class: |
3.3.6.6 (3)Sulfides - Sulfosalts |
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(3.3)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(3.3.6)Tetrahedrite Group (Isometric: I4¯3m) |
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3.3.6.1 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m |
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3.3.6.2 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m |
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3.3.6.3 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m |
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3.3.6.4 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m |
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3.3.6.5 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m |
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3.3.6.6 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m |
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3.3.6.7 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m |
Strunz Class: |
II/C.11-60 II - Sulfides and sulphosalts |
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II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1 |
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II/C.11 - Tetrahedrite group |
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II/C.11-10 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m |
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II/C.11-20 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m |
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II/C.11-30 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m |
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II/C.11-40 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m |
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II/C.11-50 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m |
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II/C.11-60 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m |
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II/C.11-70 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m |
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II/C.11-75 Mgriite Cu3AsSe3 F d3m 4/m 3 2/m |
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II/C.11-80 Chameanite (Cu,Fe)4As(Se,S)4 I 43m 4 3m |
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Other Goldfieldite Information
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References: |
NAME( Ford32) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Goldfieldite :
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 - WWW-MINCRYST
13 -École des Mines de Paris
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Print or Cut-and-Paste your Goldfieldite Specimen Label here :
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Goldfieldite
Cu12(Te,Sb,As)4S13
Dana No: 3.3.6.6 Strunz No: II/C.11-60
Locality:
Notes:
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