Mineralogy Database

Barquillite Mineral Data

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General Barquillite Information

Help on Chemical  Formula: Chemical Formula: Cu2CdGeS4
Help on Composition: Composition: Molecular Weight = 440.38 gm
   Cadmium    25.53 %  Cd
   Copper     28.86 %  Cu
   Germanium  16.49 %  Ge
   Sulfur     29.13 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: Cu2CdGeS4
Help on Environment: Environment: The cadmium dominant analog of briartite. A member of the Stannite group.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Fuentes Villanas mine, Barquilla Sn-Ge-Cd-Cu-Fe vein-type deposit, southwestern Salamanca, Spain. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Barquilla, a village near the discovery locality.
Help on Name Pronunciation: Name Pronunciation: Barquillite + Pronunciation Say BARQUILLITE
Help on Synonym: Synonym: IMA1996-050

Barquillite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.94495
Help on Cell Dimensions: Cell Dimensions: a = 5.45, c = 10.6, Z = 2; V = 314.85 Den(Calc)= 4.64
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.1(1), 1.92(0.8), 1.89(0.7),

Physical Properties of Barquillite

Help on Color: Color: Gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Metallic

Optical Properties of Barquillite

Help on RL Anisotrophism: RL Anisotrophism: Very weak.
Help on RL Bireflectance: RL Bireflectance: Very weak.
Help on RL Color: RL Color: Gray with a pale violet tint.
Help on RL Pleochroism: RL Pleochroism: Very weak.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Barquillite in Air
λ R  ∑ R(λ) 
 460 nm   24.42   
 480 nm   24.18 
 540 nm   23.29 
 560 nm   23.19 
 580 nm   23.04 
 600 nm   23.07 
 640 nm   23.28 
 660 nm   23.46 
Standardized Intensity (100%) Reflection Spectra of Barquillite in Oil
λ R  ∑ R(λ) 
 460 nm   10.79   
 480 nm   10.49 
 540 nm    9.85 
 560 nm    9.69 
 580 nm    9.59 
 600 nm    9.54 
 640 nm    9.72 
 660 nm    9.91 
Calculated Relative Intensity Colors of Barquillite in Air
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%
Calculated Relative Intensity Colors of Barquillite in Oil
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 910%

Calculated Properties of Barquillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.26 gm/cc
note: Specific Gravity of Barquillite =4.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEBarquillite = 92.33 barns/electron
U=PEBarquillite x rElectron Density= 393.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barquillite is Not Radioactive

Barquillite Classification

Help on  Dana Class: Dana Class: (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 Stannite Cu2FeSnS4 I 42m 4 2m Cernyite Cu2CdSnS4 I 42m 4 2m Briartite Cu2(Zn,Fe)GeS4 I 42m 4 2m Kuramite Cu3SnS4 I 42m 4 2m Sakuraiite (Cu,Zn,Fe,In,Sn)4S4 P 432, P 43m, or P m3m Cubic Hocartite Ag2FeSnS4 I 42m 4 2m Pirquitasite Ag2ZnSnS4 I 42m 4 2m Velikite Cu2HgSnS4 I 42m 4 2m Kesterite Cu2(Zn,Fe)SnS4 I 4 4 Ferrokesterite Cu2(Fe,Zn)SnS4 I 42m 4 2m Barquillite! Cu2CdGeS4 I 42m 4 2m
Help on  Strunz Class: 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 Barquillite Information

Help on References: References: NAME( CanMin, 8/1999) PHYS. PROP.(AmMin, V84, p1464) OPTIC PROP.(AmMin, V84, p 1464)
Help on See Also: 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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Dana No: Strunz No: 02.KA.10





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