General Barquillite Information
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Chemical Formula: |
Cu2CdGeS4 |
Composition: |
Molecular Weight = 440.38 gm |
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Cadmium 25.53 % Cd |
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Copper 28.86 % Cu |
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Germanium 16.49 % Ge |
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Sulfur 29.13 % S |
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______ |
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100.00 % |
Empirical Formula: |
Cu2CdGeS4 |
Environment: |
The cadmium dominant analog of briartite. A member of the Stannite group. |
IMA Status: |
Approved IMA 1996 (Dana # Added) |
Locality: |
Fuentes Villanas mine, Barquilla Sn-Ge-Cd-Cu-Fe vein-type deposit, southwestern Salamanca, Spain. Link to MinDat.org Location Data. |
Name Origin: |
Named after Barquilla, a village near the discovery locality. |
Synonym: |
IMA1996-050 |
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Search for Barquillite Images |
Images:
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Barquillite Crystallography
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Axial Ratios: |
a:c = 1:1.94495 |
Cell Dimensions: |
a = 5.45, c = 10.6, Z = 2; V = 314.85 Den(Calc)= 4.64 |
Crystal System: |
Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m |
X Ray Diffraction: |
By Intensity(I/Io): 3.1(1), 1.92(0.8), 1.89(0.7), |
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Physical Properties of Barquillite
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Color: |
Gray. |
Diaphaniety: |
Opaque |
Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Habit: |
Rosette - Bundled tabular aggregates resembling rose flower petals. |
Hardness: |
4-4.5 - Between Fluorite and Apatite |
Luster: |
Metallic |
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Optical Properties of Barquillite
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RL Anisotrophism: |
Very weak. |
RL Bireflectance: |
Very weak. |
RL Color: |
Gray with a pale violet tint. |
RL Pleochroism: |
Very weak. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Barquillite in Air
| λ |
R |
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∑ R(λ) |
| 460 nm |
24.42 |
 |
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| 480 nm |
24.18 |
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| 540 nm |
23.29 |
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| 560 nm |
23.19 |
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| 580 nm |
23.04 |
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| 600 nm |
23.07 |
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| 640 nm |
23.28 |
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| 660 nm |
23.46 |
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Standardized Intensity (100%) Reflection Spectra of Barquillite in Oil
| λ |
R |
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∑ R(λ) |
| 460 nm |
10.79 |
 |
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| 480 nm |
10.49 |
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| 540 nm |
9.85 |
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| 560 nm |
9.69 |
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| 580 nm |
9.59 |
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| 600 nm |
9.54 |
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| 640 nm |
9.72 |
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| 660 nm |
9.91 |
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Calculated Relative Intensity Colors of Barquillite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
380% |
| R |
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Calculated Relative Intensity Colors of Barquillite in Oil
Relative Intensity |
0% |
100% |
200% |
300% |
400% |
500% |
600% |
700% |
800% |
900% |
910% |
| R |
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Calculated Properties of Barquillite
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Electron Density: |
relectron=4.26 gm/cc note: rBarquillite =4.64 gm/cc. |
Fermion Index |
Fermion Index = 0.07893 Boson Index = 0.92107 |
Photoelectric: |
PEBarquillite = 92.33 barns/electron U=PEBarquillite x relectron= 393.03 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Barquillite is Not Radioactive |
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Barquillite Classification
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Dana Class: |
2.9.2.11 (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.06-45 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 Barquillite Information
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References: |
NAME( CanMin, 8/1999) PHYS. PROP.(AmMin, V84, p1464) OPTIC PROP.(AmMin, V84, p 1464) |
See Also: |
Links to other databases for Barquillite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -Handbook of Mineralogy (UofA)
6 -MinDAT
7 -MinMax(Deutsch)
8 -MinMax(English)
9 -Mineralienatlas (Deutsch)
10 -QUT Mineral Atlas
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Print or Cut-and-Paste your Barquillite Specimen Label here :
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Barquillite
Cu2CdGeS4
Dana No: 2.9.2.11 Strunz No: II/C.06-45
Locality:
Notes:
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