Giraudite Mineral Data

Giraudite Mineral Data +

General Giraudite Information

Chemical Formula:

(Cu,Zn,Ag)12(As,Sb)4(Se,S)13

Composition:

Molecular Weight = 2,042.97 gm

Zinc 11.52 % Zn

Copper 22.40 % Cu

Silver 6.34 % Ag

Antimony 5.96 % Sb

Arsenic 11.00 % As

Selenium 37.68 % Se

Sulfur 5.10 % S

______

100.00 %

Empirical Formula:

Cu_7.2Zn_3.6Ag_1.2As₃SbSe_9.75S_3.25

Environment:

As late stage deposits in veins cutting granite.

IMA Status:

Approved IMA 1982

Locality:

From Chameane, Puy-de-Dome, France. Link to MinDat.org Location Data.

Name Origin:

To honor Roger Giraud, of the electron microprobe laboratory of the B.R.G.M.-C.N.R.S. in Orleans, France.

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Giraudite Crystallography

Cell Dimensions:

a = 10.578, Z = 2; V = 1,183.62 Den(Calc)= 5.73

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): 3.05(1), 1.868(0.9), 1.593(0.7),

Physical Properties of Giraudite

Cleavage:

None

Color:

Gray, Steel gray.

Density:

5.75

Diaphaniety:

Opaque

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Streak:

white

Optical Properties of Giraudite

RL Color:

Light gray with a creamy tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Giraudite in Air**
λ	R	∑ R(λ)
420 nm	32.20
440 nm	32.10
460 nm	31.80
480 nm	31.70
500 nm	31.60
520 nm	31.50
540 nm	31.70
560 nm	31.80
580 nm	31.70
600 nm	31.70
620 nm	31.80
640 nm	31.60
660 nm	31.50
680 nm	31.30
700 nm	30.80

**Calculated Relative Intensity Colors of Giraudite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	280%
R

Calculated Properties of Giraudite

Electron Density:

r_electron=5.09 gm/cc
note: r_Giraudite=5.73 gm/cc.

Fermion Index

Fermion Index = 0.03374
Boson Index = 0.96626

Photoelectric:

PE_Giraudite= 90.89 barns/electron
U=PE_Giraudite x r_electron= 462.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Giraudite is Not Radioactive

Giraudite Classification

Dana Class:

3.3.6.5 (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.11-30 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 Giraudite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Giraudite :
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 -École des Mines de Paris

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Giraudite

(Cu,Zn,Ag)12(As,Sb)4(Se,S)13
Dana No: 3.3.6.5 Strunz No: II/C.11-30
Locality:

Notes: