Goldfieldite Mineral Data

Goldfieldite Mineral Data +

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General Goldfieldite Information

Chemical Formula:

Cu12(Te,Sb,As)4S13

Composition:

Molecular Weight = 1,665.23 gm

Copper 45.79 % Cu

Antimony 4.39 % Sb

Tellurium 22.99 % Te

Arsenic 1.80 % As

Sulfur 25.03 % S

______

100.00 %

Empirical Formula:

Cu₁₂Te₃Sb_0.6As_0.4S₁₃

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

PDF 29-531

Goldfieldite Image

Images:

Goldfieldite

Comments: Back granular goldfieldite in white quartz.
Location: Mohawk Mine, Goldfield, Esmeralda County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Goldfieldite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Physical Properties of Goldfieldite

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

Optical Properties of Goldfieldite

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Goldfieldite in Air**
λ	R	∑ R(λ)
400 nm	31.10
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
680 nm	31.00
700 nm	31.10

**Calculated Relative Intensity Colors of Goldfieldite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	290%
R

Calculated Properties of Goldfieldite

Electron Density:

r_electron=4.58 gm/cc
note: r_Goldfieldite=5.05 gm/cc.

Fermion Index

Fermion Index = 0.02024
Boson Index = 0.97976

Photoelectric:

PE_Goldfieldite= 115.82 barns/electron
U=PE_Goldfieldite x r_electron= 530.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goldfieldite is Not Radioactive

Goldfieldite Classification

Dana Class:

3.3.6.6 (3)Sulfides - Sulfosalts

(3.3)where 3 < z/y < 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.3.6)Tetrahedrite Group (Isometric: I4¯3m)

3.3.6.1 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m

3.3.6.2 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m

3.3.6.3 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m

3.3.6.4 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m

3.3.6.5 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m

3.3.6.6 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m

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

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.11 - Tetrahedrite group

II/C.11-10 Tennantite (Cu,Fe)12As4S13 I 43m 4 3m

II/C.11-20 Argentotennantite (Ag,Cu)10(Zn,Fe)2(As,Sb)4S13 I 43m 4 3m

II/C.11-30 Giraudite (Cu,Zn,Ag)12(As,Sb)4(Se,S)13 I 43m 4 3m

II/C.11-40 Tetrahedrite (Cu,Fe)12Sb4S13 I 43m 4 3m

II/C.11-50 Freibergite (Ag,Cu,Fe)12(Sb,As)4S13 I 43m 4 3m

II/C.11-60 Goldfieldite Cu12(Te,Sb,As)4S13 I 43m 4 3m

II/C.11-70 Hakite (Cu,Hg)3(Sb,As)(Se,S)3 I 43m 4 3m

II/C.11-75 Mgriite Cu3AsSe3 F d3m 4/m 3 2/m

II/C.11-80 Chameanite (Cu,Fe)4As(Se,S)4 I 43m 4 3m

Other Goldfieldite Information

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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Goldfieldite

Cu12(Te,Sb,As)4S13
Dana No: 3.3.6.6 Strunz No: II/C.11-60
Locality:

Notes: