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Briartite Mineral Data
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General Briartite Information
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 Chemical Formula: |
Cu2(Zn,Fe)GeS4 |
| Composition: |
Molecular Weight = 390.97 gm |
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Zinc 12.54 % Zn |
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Iron 3.57 % Fe |
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Copper 32.51 % Cu |
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Germanium 18.57 % Ge |
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Sulfur 32.81 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu2Zn0.75Fe2+0.25GeS4 |
| Environment: |
As inclusions in other Ge-Ga-bearing sulfides. |
| IMA Status: |
Approved IMA 1965 |
| Locality: |
From Kipushi, Shaba Province, Zaire. Link to MinDat.org Location Data. |
| Name Origin: |
For Gaston Briart, who studied the Kipushi deposit. |
| Name Pronunciation: |
Briartite + Pronunciation  |
| Synonym: |
ICSD 47165 |
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PDF 26-527 |
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Briartite Image |
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Images:
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Briartite Catamarcaite Bornite
Comments: Briartite-type phase (Bri) in close association with catamarcaite (Ct) lining a cavity in massive bornite (Bn) - chalcocite (Cc) ore; Sp is sphalerite (CanMin v44:1481).
Location: Bornite-rich ore from old dumps near the La Rosario vein, Capillitas epithermal deposit, Catamarca Province, Argentina..
Scale: See Image.
© Canadian Mineralogist |
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Briartite Crystallography
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| Axial Ratios: |
a:c = 1:1.97556 |
| Cell Dimensions: |
a = 5.32, c = 10.51, Z = 2; V = 297.46 Den(Calc)= 4.36 |
| Crystal System: |
Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.06(1), 1.87(0.5), 1.89(0.5), |
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Physical Properties of Briartite
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| Color: |
Blue gray, Gray, Iron gray. |
| Density: |
4.5 |
| Diaphaneity: |
Opaque |
| Hardness: |
3.5-4 - Copper Penny-Fluorite |
| Luster: |
Metallic |
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Optical Properties of Briartite
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| RL Anisotrophism: |
Weak in air, distinct in oil. |
| RL Color: |
Gray to gray blue. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Briartite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
23.40 |
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| 420 nm |
24.20 |
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| 440 nm |
25.00 |
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| 460 nm |
25.70 |
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| 480 nm |
26.40 |
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| 500 nm |
27.00 |
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| 520 nm |
27.40 |
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| 540 nm |
27.60 |
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| 560 nm |
27.50 |
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| 580 nm |
27.20 |
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| 600 nm |
26.80 |
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| 620 nm |
26.00 |
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| 640 nm |
25.00 |
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| 660 nm |
23.80 |
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| 680 nm |
22.50 |
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| 700 nm |
21.20 |
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Calculated Relative Intensity Colors of Briartite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
350% |
| R |
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Calculated Properties of Briartite
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| Electron Density: |
Bulk Density (Electron Density)=4.08 gm/cc
note: Specific Gravity of Briartite =4.36 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEBriartite = 35.41 barns/electron
U=PEBriartite x rElectron Density= 144.54 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Briartite is Not Radioactive |
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Briartite Classification
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| Dana Class: |
02.09.02.03 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type |
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02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m |
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02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m |
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02.09.02.03 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m |
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02.09.02.05 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic |
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02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m |
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02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m |
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02.09.02.09 Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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02.09.02.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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02.09.02.11 Barquillite! Cu2CdGeS4 I 42m 4 2m |
| Strunz Class: |
02.KA.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.K - Sulfarsenates, Sulfantimonates |
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02.KA -Sulfarsenates with (As,Sb)S4 tetrahedra |
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02.KA.10 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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02.KA.10 Barquillite! Cu2CdGeS4 I 42m 4 2m |
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02.KA.10 Famatinite Cu3SbS4 I 42m 4 2m |
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02.KA.10 Luzonite Cu3AsS4 I 42m 4 2m |
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02.KA.10 Permingeatite Cu3SbSe4 I 42m 4 2m |
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Other Briartite 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 Briartite :
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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Briartite
Cu2(Zn,Fe)GeS4
Dana No: 02.09.02.03 Strunz No: 02.KA.10
Locality:
Notes:
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