Barquillite
A valid IMA mineral species
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About Barquillite
Barquilla, Spain
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
IMA Classification of Barquillite
Approved
IMA Formula:
Cu1+2(Cd2+,Fe2+)Ge4+S2-4
Approval year:
1996
First published:
1999
Type description reference:
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 for Standard |
|---|---|---|
| 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 | R1 (%) |
|---|---|
| 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). Peak reflectance is 24.8%.
Colour in reflected light:
Gray with a violet tint
Pleochroism:
Weak
Chemistry of Barquillite
Mindat Formula:
Cu2CdGeS4
Element Weights:
Elements listed:
Common Impurities:
Ag,Zn,Fe,Mn,Sn,Ga,Sb,Bi
Crystallography of Barquillite
Crystal System:
Tetragonal
Class (H-M):
42m - Scalenohedral
Space Group:
I42m
Setting:
I42m
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) |
Reference:
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:
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 | Cu2FeGeS4 |
| 2.KA.10 | Keutschite | Cu2AgAsS4 |
| 2.KA.10 | Permingeatite | Cu3SbSe4 |
| 2.KA.10 | Luzonite | Cu3AsS4 |
| 2.KA.10 | Famatinite | Cu3SbS4 |
| 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:
Murciego, Ascensión, Pascua, Ma Inmaculada, Babkine, Jean, Dusausoy, Yves, Medenbach, Olaf, Bernhardt, Hans-Jürgen (1999) Barquillite, Cu2(Cd, Fe)GeS4, a new mineral from the Barquilla deposit, Salamanca, Spain. European Journal of Mineralogy, 11 (1) 111-118 doi:10.1127/ejm/11/1/0111
Localities for Barquillite
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Spain (TL) | |
| Murciego et al. (1999) +2 other references |
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Fuentes Villanas Mine, Barquilla Sn-Ge-Cd-Cu-Fe Deposit, Villar de la Yegua, Salamanca, Castile and Leon, Spain