Briartite Mineral Data

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General Briartite Information

Chemical Formula:

Cu2(Zn,Fe)GeS4

Composition:

Molecular Weight = 390.97 gm

Zinc 12.54 % Zn

Iron 3.57 % Fe

Copper 32.51 % Cu

Germanium 18.57 % Ge

Sulfur 32.81 % S

______

100.00 %

Empirical Formula:

Cu₂Zn_0.75Fe²⁺_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

PDF 26-527

Briartite Image

Images:

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

Briartite Crystallography

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

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

By Intensity(I/I_o): 3.06(1), 1.87(0.5), 1.89(0.5),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Wintenberger M , Materials Research Bulletin , 14 (1979) p.1195-1202, Etude de la structure cristallographique et magnetique de Cu2FeGeS4 et remarque, sur la structure magnetique de Cu2MnSnS4

Physical Properties of Briartite

Color:

Blue gray, Gray, Iron gray.

Density:

4.5

Diaphaneity:

Opaque

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Optical Properties of Briartite

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	∑ R(λ)
400 nm	23.40
420 nm	24.20
440 nm	25.00
460 nm	25.70
480 nm	26.40
500 nm	27.00
520 nm	27.40
540 nm	27.60
560 nm	27.50
580 nm	27.20
600 nm	26.80
620 nm	26.00
640 nm	25.00
660 nm	23.80
680 nm	22.50
700 nm	21.20

**Calculated Relative Intensity Colors of Briartite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	350%
R

Calculated Properties of Briartite

Electron Density:

Bulk Density (Electron Density)=4.08 gm/cc
note: Specific Gravity of Briartite =4.36 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Briartite= 35.41 barns/electron
U=PE_Briartite x rElectron Density= 144.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Briartite is Not Radioactive

Briartite Classification

Dana Class:

02.09.02.03 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.02)Stannite Group (Tetragonal: I-42m) A2BCS type

02.09.02.01 Stannite Cu2FeSnS4 I 42m 4 2m

02.09.02.02 Cernyite Cu2CdSnS4 I 42m 4 2m

02.09.02.03 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

02.09.02.04 Kuramite Cu3SnS4 I 42m 4 2m

02.09.02.05 Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 4₃2, P 43m, or P m3m Cubic

02.09.02.06 Hocartite Ag2FeSnS4 I 42m 4 2m

02.09.02.07 Pirquitasite Ag2ZnSnS4 I 42m 4 2m

02.09.02.08 Velikite Cu2HgSnS4 I 42m 4 2m

02.09.02.09 Kesterite Cu2(Zn,Fe)SnS4 I 4 4

02.09.02.10 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m

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

02.K - Sulfarsenates, Sulfantimonates

02.KA -Sulfarsenates with (As,Sb)S4 tetrahedra

02.KA.10 Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m

02.KA.10 Barquillite! Cu2CdGeS4 I 42m 4 2m

02.KA.10 Famatinite Cu3SbS4 I 42m 4 2m

02.KA.10 Luzonite Cu3AsS4 I 42m 4 2m

02.KA.10 Permingeatite Cu3SbSe4 I 42m 4 2m

Other Briartite Information

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Briartite Specimen Label here :

Briartite

Cu2(Zn,Fe)GeS4
Dana No: 02.09.02.03 Strunz No: 02.KA.10
Locality:

Notes: