Barquillite Mineral Data

General Barquillite Information

Chemical Formula:

Cu2CdGeS4

Composition:

Molecular Weight = 440.38 gm

Cadmium 25.53 % Cd

Copper 28.86 % Cu

Germanium 16.49 % Ge

Sulfur 29.13 % S

______

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

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

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

By Intensity(I/I_o): 3.1(1), 1.92(0.8), 1.89(0.7),

Physical Properties of Barquillite

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

Optical Properties of Barquillite

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	∑ 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**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	360%	380%
R

**Calculated Relative Intensity Colors of Barquillite in Oil**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	910%
R

Calculated Properties of Barquillite

Electron Density:

Bulk Density (Electron Density)=4.26 gm/cc
note: Specific Gravity of Barquillite =4.64 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Barquillite= 92.33 barns/electron
U=PE_Barquillite x rElectron Density= 393.03 barns/cc.

Radioactivity:

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

Barquillite Classification

Dana Class:

02.09.02.11 (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 Barquillite Information

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 :

Barquillite

Cu2CdGeS4
Dana No: 02.09.02.11 Strunz No: 02.KA.10
Locality:

Notes: