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Giraudite Mineral Data
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General Giraudite Information
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 Chemical Formula: |
(Cu,Zn,Ag)12(As,Sb)4(Se,S)13 |
| Composition: |
Molecular Weight = 2,042.97 gm |
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Zinc 11.52 % Zn |
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Copper 22.40 % Cu |
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Silver 6.34 % Ag |
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Antimony 5.96 % Sb |
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Arsenic 11.00 % As |
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Selenium 37.68 % Se |
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Sulfur 5.10 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu7.2Zn3.6Ag1.2As3SbSe9.75S3.25 |
| 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. |
| Name Pronunciation: |
Giraudite + Pronunciation  |
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Giraudite Image |
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Images:
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Giraudite Hakite
Comments: Polished Section image of giraudite-hakite (gir-hak) with berzelianite (bzl ) and galena (gln). (CanMin, v40:1161).
Location: Niederschlema-Alberoda uranium deposit, Erzgebirge, Germany.
Scale: See Image.
© Canadian Mineralogist |
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Giraudite Crystallography
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| Cell Dimensions: |
a = 10.578, Z = 2; V = 1,183.62 Den(Calc)= 5.73 |
| Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: I 43m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.05(1), 1.868(0.9), 1.593(0.7), |
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Physical Properties of Giraudite
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| Cleavage: |
None |
| Color: |
Gray, Steel gray. |
| Density: |
5.75 |
| Diaphaneity: |
Opaque |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
| Streak: |
white |
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Optical Properties of Giraudite
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| RL Color: |
Light gray with a creamy tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Giraudite in Air
| λ |
R |
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∑ R(λ) |
| 420 nm |
32.20 |
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| 440 nm |
32.10 |
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| 460 nm |
31.80 |
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| 480 nm |
31.70 |
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| 500 nm |
31.60 |
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| 520 nm |
31.50 |
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| 540 nm |
31.70 |
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| 560 nm |
31.80 |
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| 580 nm |
31.70 |
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| 600 nm |
31.70 |
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| 620 nm |
31.80 |
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| 640 nm |
31.60 |
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| 660 nm |
31.50 |
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| 680 nm |
31.30 |
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| 700 nm |
30.80 |
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Calculated Relative Intensity Colors of Giraudite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
280% |
| R |
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Calculated Properties of Giraudite
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| Electron Density: |
Bulk Density (Electron Density)=5.09 gm/cc
note: Specific Gravity of Giraudite =5.73 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEGiraudite = 90.89 barns/electron
U=PEGiraudite x rElectron Density= 462.28 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Giraudite is Not Radioactive |
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Giraudite Classification
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| Dana Class: |
03.03.06.05 (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 Giraudite Information
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| 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 - 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
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Giraudite
(Cu,Zn,Ag)12(As,Sb)4(Se,S)13
Dana No: 03.03.06.05 Strunz No: 02.GB.05
Locality:
Notes:
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