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Barquillite Mineral Data
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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. |
| Name Pronunciation: |
Barquillite + Pronunciation  |
| Synonym: |
IMA1996-050 |
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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 - Scalenohedral H-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. |
| Diaphaneity: |
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 |
 |
| 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: |
Bulk Density (Electron Density)=4.26 gm/cc
note: Specific Gravity of Barquillite =4.64 gm/cc.
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| Fermion Index: |
Fermion Index = 0.07
Boson Index = 0.93 |
| Photoelectric: |
PEBarquillite = 92.33 barns/electron
U=PEBarquillite x rElectron Density= 393.03 barns/cc.
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| 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: |
02.09.02.11 (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 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Print or Cut-and-Paste your Barquillite Specimen Label here :
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Barquillite
Cu2CdGeS4
Dana No: 02.09.02.11 Strunz No: 02.KA.10
Locality:
Notes:
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