Barquillite
A valid IMA mineral species
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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.
Unique Identifiers
Mindat ID:
6820
Long-form identifier:
mindat:1:1:6820:4
GUID
(UUID V4):
(UUID V4):
76a9de7e-4ec0-4d20-874c-2e56a8d34600
IMA Classification of Barquillite
Approved
IMA Formula:
Cu2(Cd,Fe)GeS4
First published:
1999
Classification of Barquillite
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
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
K : Sulfarsenates, Sulfantimonates
A : Sulfarsenates with (As,Sb)S4 tetrahedra
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Bql | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Barquillite
Metallic
Transparency:
Opaque
Hardness:
4 - 4½ on Mohs scale
Hardness:
VHN100=180 - 300 - Vickers
Cleavage:
None Observed
Density:
4.53 g/cm3 (Calculated)
Optical Data of Barquillite
Anisotropism:
Very weak
Bireflectance:
Very weak
Reflectivity:
Wavelength | R |
---|---|
400nm | 24.8% |
420nm | 24.8% |
440nm | 24.7% |
460nm | 24.4% |
480nm | 24.2% |
500nm | 23.8% |
520nm | 23.5% |
540nm | 23.3% |
560nm | 23.2% |
580nm | 23.0% |
600nm | 23.1% |
620nm | 23.1% |
640nm | 23.3% |
660nm | 23.5% |
680nm | 23.3% |
700nm | 22.9% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 24.8%.
Colour in reflected light:
Gray with a violet tint
Pleochroism:
Weak
Chemistry of Barquillite
Mindat Formula:
Cu2CdGeS4
Elements listed:
Common Impurities:
Ag,Zn,Fe,Mn,Sn,Ga,Sb,Bi
Crystallography of Barquillite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.10 Å | (100) |
2.73 Å | (10) |
1.92 Å | (80) |
1.89 Å | (70) |
1.64 Å | (60) |
1.60 Å | (20) |
Comments:
Barquilla deposit, Spain. Data from the type description.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 3b: Earth’s earliest hydrosphere | >4.45 |
12 : Hadean hydrothermal subsurface sulfide deposits (see also #33) |
Type Occurrence of Barquillite
General Appearance of Type Material:
Platy crystals, to 50 μm, commonly in rosette-like aggregates.
Place of Conservation of Type Material:
Museo Geominero, Madrid, Spain, 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.
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:
Reference:
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.
Synonyms of Barquillite
Other Language Names for Barquillite
Related Minerals - Strunz-mindat Grouping
2.KA.05 | Enargite | Cu3AsS4 |
2.KA.05 | Petrukite | (Cu,Fe,Zn,Ag)3(Sn,In)S4 |
2.KA.10 | Briartite | Cu2(Fe,Zn)GeS4 |
2.KA.10 | Famatinite | Cu3SbS4 |
2.KA.10 | Luzonite | Cu3AsS4 |
2.KA.10 | Permingeatite | Cu3SbSe4 |
2.KA.10 | Keutschite | Cu2AgAsS4 |
2.KA.10 | Zincobriartite | Cu2(Zn,Fe)(Ge,Ga)S4 |
2.KA.15 | Fangite | Tl3AsS4 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Barquillite
mindat.org URL:
https://www.mindat.org/min-6820.html
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References for Barquillite
Reference List:
Localities for Barquillite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Spain (TL) | |
| Murciego et al. (1999) +2 other references |
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