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Barquillite

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Formula:
Cu2CdGeS4
Lustre:
Metallic
Hardness:
4 - 4½
Specific Gravity:
4.53 (Calculated)
Crystal System:
Tetragonal
Name:
Named after Barquilla, a village near the discovery locality, the Fuentes Villanas Mine, Barquilla Sn-Ge-Cd-Cu-Fe deposit, Salamanca, Castile and Leon, Spain.
This page provides mineralogical data about Barquillite.


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Classification of BarquilliteHide

Approved
2.KA.10

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
K : Sulfarsenates, Sulfantimonates
A : Sulfarsenates with (As,Sb)S4 tetrahedra

Physical Properties of BarquilliteHide

Metallic
Transparency:
Opaque
Hardness:
4 - 4½ on Mohs scale
Hardness:
VHN100=180 - 300 - Vickers
Density:
4.53 g/cm3 (Calculated)

Optical Data of BarquilliteHide

Type:
Anisotropic
Anisotropism:
Very weak
Bireflectance:
Very weak
Reflectivity:
400nmR=24.8%
420nmR=24.8%
440nmR=24.7%
460nmR=24.4%
480nmR=24.2%
500nmR=23.8%
520nmR=23.5%
540nmR=23.3%
560nmR=23.2%
580nmR=23.0%
600nmR=23.1%
620nmR=23.1%
640nmR=23.3%
660nmR=23.5%
680nmR=23.3%
700nmR=22.9%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 24.8%.
Pleochroism:
Weak

Chemical Properties of BarquilliteHide

Formula:
Cu2CdGeS4
IMA Formula:
Cu2(Cd,Fe)GeS4
Common Impurities:
Ag,Zn,Fe,Mn,Sn,Ga,Sb,Bi

Crystallography of BarquilliteHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2m
Setting:
I4 2m
Cell Parameters:
a = 5.45(4) Å, c = 10.61(1) Å
Ratio:
a:c = 1 : 1.947
Unit Cell V:
315.14 ų (Calculated from Unit Cell)
Z:
2
Comment:
sp. gr. by analogy to briartite

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.10 (100)
2.73 (10)
1.92 (80)
1.89 (70)
1.64 (60)
1.60 (20)
Comments:
Barquilla deposit, Spain.

Type Occurrence of BarquilliteHide

General Appearance of Type Material:
Platy crystals, to 50 μm, commonly in rosette-like aggregates.
Place of Conservation of Type Material:
Museo Geominero, Madrid, MGM-3000; Department of Geology, Salamanca; Area of Crystallography and Mineralogy, Badajoz, Spain; Institute for Mineralogy, Ruhr University, Bochum, Germany; Laboratory of Crystallography, Nancy, France.
Geological Setting of Type Material:
In a hydrothermal Sn–Ge–Cd–Cu–Fe vein deposit.
Associated Minerals at Type Locality:

Synonyms of BarquilliteHide

Other Language Names for BarquilliteHide

Related Minerals - Nickel-Strunz GroupingHide

2.KA.05EnargiteCu3AsS4Orth. mm2 : Pmn21
2.KA.05Petrukite(Cu,Fe,Zn,Ag)3(Sn,In)S4Orth.
2.KA.10BriartiteCu2(Fe,Zn)GeS4Tet.
2.KA.10FamatiniteCu3SbS4Tet. 4 2m : I4 2m
2.KA.10LuzoniteCu3AsS4Tet. 4 2m : I4 2m
2.KA.10PermingeatiteCu3SbSe4Tet.
2.KA.15FangiteTl3AsS4Orth.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BarquilliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Murciego, A., Pascua, M.I., Babkine, J., Dusausoy, Y., Medenbach, O. and Bernhardt, H.-J. (1999): Barquillite, Cu2(Cd, Fe)GeS4, a new mineral from the Barquilla deposit, Salamanca, Spain. European Journal of Mineralogy, 11, 111-117.

Internet Links for BarquilliteHide

Localities for BarquilliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Spain (TL)
 
  • Castile and Leon
    • Salamanca
      • Barquilla Sn-Ge-Cd-Cu-Fe Deposit
European Journal of Mineralogy 11 (1999), 111; AM 84 (1999), 1464; MR 30 (1999), 399
Mineral and/or Locality  
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