Koutekite
A valid IMA mineral species - grandfathered
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About Koutekite
Jaromír Koutek
Formula:
Cu5As2
Colour:
Bluish-white
Lustre:
Metallic
Hardness:
3½
Specific Gravity:
8.48
Crystal System:
Hexagonal
Name:
Named in 1958 by Zdenek Johan in honor of Jaromir Koutek (1 April 1902, Trebic, Czech Republic - 5 February 1983, Prague, Czech Republic), professor of economic geology, Charles University, Prague.
This page provides mineralogical data about Koutekite.
Unique Identifiers
Mindat ID:
2265
Long-form identifier:
mindat:1:1:2265:7
IMA Classification of Koutekite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1958
Type description reference:
Classification of Koutekite
2.AA.10d
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
A : Alloys of metalloids with Cu, Ag, Au
2.3.1.1
2 : SULFIDES
3 : AmBnXp, with (m+n):p = 5:2
2 : SULFIDES
3 : AmBnXp, with (m+n):p = 5:2
1.36
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)
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 |
|---|---|---|
| Kou | 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 Koutekite
Metallic
Transparency:
Opaque
Colour:
Bluish-white
Streak:
Black
Hardness:
3½ on Mohs scale
Hardness:
VHN25=136 - 157 kg/mm2 - Vickers
Density:
8.48 g/cm3 (Measured) 8.437 g/cm3 (Calculated)
Optical Data of Koutekite
Anisotropism:
Strong
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 440nm | 45.9% | 46.4% |
| 480nm | 43.0% | 41.4% |
| 520nm | 40.0% | 37.6% |
| 560nm | 38.0% | 34.5% |
| 600nm | 37.2% | 32.2% |
| 640nm | 37.6% | 30.7% |
| 680nm | 38.5% | 29.9% |
| 700nm | 39.2% | 29.8% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 46.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Bluish gray
Internal Reflections:
None
Chemistry of Koutekite
Mindat Formula:
Cu5As2
Elements listed:
Common Impurities:
Fe
Crystallography of Koutekite
Crystal System:
Hexagonal
Cell Parameters:
a = 23.06 Å, c = 14.54 Å
Ratio:
a:c = 1 : 0.631
Unit Cell V:
6,695.97 ų (Calculated from Unit Cell)
Comment:
Orthorhombic or hexagonal. Point Group: 2/m 2/m 2/m or n.d.;Space Group: Ibam or n.d.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014136 | Koutekite | Liebisch W, Schubert K (1971) Zur struktur der mischung kupfer-arsen Journal of the Less-Common Metals 23 231-236 | 1971 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.078 Å | (100) |
| 2.024 Å | (100) |
| 1.994 Å | (100) |
| 1.147 Å | (90) |
| 1.324 Å | (80) |
| 1.197 Å | (80) |
| 1.178 Å | (80) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Koutekite
General Appearance of Type Material:
Small grains intergrown with a copper arsenide
Place of Conservation of Type Material:
1) Charles University, Prague, Czech Republic, 18269.
2) National Museum of Natural History, Washington, D.C., USA, 162605.
2) National Museum of Natural History, Washington, D.C., USA, 162605.
Associated Minerals at Type Locality:
Other Language Names for Koutekite
Common Associates
Associations Based on Photo Data:
| 41 photos of Koutekite associated with Domeykite | Cu3As |
| 35 photos of Koutekite associated with Nickeline | NiAs |
| 31 photos of Koutekite associated with Rammelsbergite | NiAs2 |
| 4 photos of Koutekite associated with Quartz | SiO2 |
| 3 photos of Koutekite associated with Native Silver | Ag |
| 2 photos of Koutekite associated with Pyrophanite | Mn2+TiO3 |
| 2 photos of Koutekite associated with Tenorite | CuO |
| 2 photos of Koutekite associated with Algodonite | (Cu1-xAsx) |
| 2 photos of Koutekite associated with 'Mohawkite' | |
| 2 photos of Koutekite associated with Paxite | CuAs2 |
Related Minerals - Strunz-mindat Grouping
| 2.AA. | Trigodomeykite | Cu3-xAs |
| 2.AA.10b | Domeykite | Cu3As |
| 2.AA.10a | Algodonite | (Cu1-xAsx) |
| 2.AA.15 | Novákite | (Cu,Ag)21As10 |
| 2.AA.20 | Cuprostibite | Cu2(Sb,Tl) |
| 2.AA.25 | Kutinaite | Ag6Cu14As7 |
| 2.AA.30 | Allargentum | (Ag1-xSbx) |
| 2.AA.35 | Dyscrasite | Ag3Sb |
| 2.AA.40 | Maldonite | Au2Bi |
| 2.AA.45 | Stistaite | SnSb |
| 2.AA.50 | Zaccariniite | RhNiAs |
| 2.AA.55 | Dienerite | Ni3As |
Other Information
Notes:
Etched by HNO3, HCl (20%), FeCl3
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 Koutekite
mindat.org URL:
https://www.mindat.org/min-2265.html
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References for Koutekite
Reference List:
Picot, Paul; Vernet, Jean (1967) Un nouveau gisement de koutekite : le dôme du Barrot (Alpes-Maritimes). Bulletin de la Société française de Minéralogie et de Cristallographie, 90 (1). 82-89 doi:10.3406/bulmi.1967.6070
Liebisch, W., Schubert, K. (1971) Zur Struktur der Mischung Kupfer-Arsen. Journal of the Less Common Metals, 23 (2). 231-236 doi:10.1016/0022-5088(71)90086-5
Tarkian, M., Bock, W. D., Neumann, M. (1983) Geology and mineralogy of the Cu-Ni-Co-U ore deposits at Talmessi and Meeskani, central Iran. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 32 (2). 111-133 doi:10.1007/bf01081105
Johan, Z. (1985) The Černý Důl deposit (Czechoslovakia): An example of Ni-, Fe-, Ag-, Cu-arsenide mineralization with extremely high activity of arsenic; new data on paxite, novakite and kutinaite. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 34 (3) 167-182 doi:10.1007/bf01082960
Localities for Koutekite
Showing 25 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.
Austria | |
| Leitner (2013) |
| Raith et al. (2015) | |
| Leitner (2015) | |
| - (1994, July) |
Czech Republic | |
| Sejkora et al. (2022) |
| ETTLER et al. (2009) |
| JOHAN (1958) +1 other reference |
France | |
| Picot et al. (1978) |
| Picot et al. (1978) | |
| Dal Bo et al. (2018) |
| Picot et al. (1967) |
| Pierrot et al. (1974) +3 other references |
| R. Pierrot |
Germany | |
| Lorenz (1998) +1 other reference |
India | |
| Singh et al. (2002) |
Iran | |
| Anthony et al. (1990) |
| Tarkian et al. (1983) +2 other references | |
Russia | |
| Shadchin et al. (2024) |
Serbia | |
| Radosavljević-Mihajlović et al. (2017) |
Slovakia | |
| Koděra et al. (1986) |
Sweden | |
| Burke (1986) |
| Nysten (1984) +1 other reference |
Switzerland | |
| Stalder et al. (1998) |
USA | |
| Eckel et al. (1997) |
| Heinrich et al. (2004) |
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Harstigen Mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden