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. |
Synonym: |
ICSD 47165 |
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PDF 26-527 |
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Search for Briartite Images |
Images:
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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 - ScalenohedralH-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 |
Diaphaniety: |
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: |
relectron=4.08 gm/cc note: rBriartite =4.36 gm/cc. |
Fermion Index |
Fermion Index = 0.02284 Boson Index = 0.97716 |
Photoelectric: |
PEBriartite = 35.41 barns/electron U=PEBriartite x relectron= 144.54 barns/cc. |
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: |
2.9.2.3 (2)Sulfides - Including Selenides and Tellurides |
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(2.9)where Am Bn Xp, with (m+n):p=1:1 |
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(2.9.2)Stannite Group (Tetragonal: I4¯2m) A2BCS type |
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2.9.2.1 Stannite Cu2FeSnS4 I 42m 4 2m |
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2.9.2.2 Cernyite Cu2CdSnS4 I 42m 4 2m |
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2.9.2.3 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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2.9.2.4 Kuramite Cu3SnS4 I 42m 4 2m |
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2.9.2.5 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic |
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2.9.2.6 Hocartite Ag2FeSnS4 I 42m 4 2m |
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2.9.2.7 Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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2.9.2.8 Velikite Cu2HgSnS4 I 42m 4 2m |
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2.9.2.9 Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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2.9.2.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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2.9.2.11 Barquillite! Cu2CdGeS4 I 42m 4 2m |
Strunz Class: |
II/C.06-40 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.06 - Stannite group |
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II/C.06-10 Luzonite Cu3AsS4 I 42m 4 2m |
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II/C.06-20 Famatinite Cu3SbS4 I 42m 4 2m |
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II/C.06-30 Permingeatite Cu3SbSe4 I 42m 4 2m |
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II/C.06-40 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m |
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II/C.06-45 Barquillite! Cu2CdGeS4 I 42m 4 2m |
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II/C.06-50 Kuramite Cu3SnS4 I 42m 4 2m |
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II/C.06-60 Stannite Cu2FeSnS4 I 42m 4 2m |
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II/C.06-70 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m |
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II/C.06-80 Kesterite Cu2(Zn,Fe)SnS4 I 4 4 |
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II/C.06-90 Cernyite Cu2CdSnS4 I 42m 4 2m |
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II/C.06-100 Velikite Cu2HgSnS4 I 42m 4 2m |
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II/C.06-110 Hocartite Ag2FeSnS4 I 42m 4 2m |
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II/C.06-120 Pirquitasite Ag2ZnSnS4 I 42m 4 2m |
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II/C.06-130 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic |
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II/C.06-140 Petrukite (Cu,Fe,Zn)2(Sn,In)S4 P mn21 mm2 |
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II/C.06-150 Rhodostannite Cu2FeSn3S8 I 41/a 4/m |
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II/C.06-160 Toyohaite Ag2FeSn3S8 I 41/a 4/m |
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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 -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 Briartite Specimen Label here :
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Briartite
Cu2(Zn,Fe)GeS4
Dana No: 2.9.2.3 Strunz No: II/C.06-40
Locality:
Notes:
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