Krut'aite
A valid IMA mineral species
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About Krut'aite
Tomáš J. Kruťa
Formula:
CuSe2
Lustre:
Metallic
Hardness:
4
Specific Gravity:
6.53 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named in 1972 by Zdenek Johan, Paul Picot, Roland Pierrot, and Milan Kvacek in honor of Tomáš Josef Kruťa (14 February 1906, Brno, Czech Republic – 18 January 1998, Brno, Czech Republic), mineralogist and mineral collector. He was Director of the Mineralogy Laboratory, Moravian Museum, Brno, Czech Republic and wrote a couple of books about minerals from the area.
Type Locality:
Dimorph of:
Unique Identifiers
Mindat ID:
2279
Long-form identifier:
mindat:1:1:2279:4
GUID
(UUID V4):
(UUID V4):
2230e298-1b25-41b3-bc2c-8cb11509580a
IMA Classification of Krut'aite
Approved
First published:
1972
Classification of Krut'aite
2.EB.05a
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2.12.1.8
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.1.15
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Krt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Krt | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Krut'aite
Optical Data of Krut'aite
Reflectivity:
| Wavelength | R |
|---|---|
| 400nm | 33.8% |
| 420nm | 34.2% |
| 440nm | 34.4% |
| 460nm | 34.4% |
| 470nm | 34.3% |
| 480nm | 34.2% |
| 500nm | 33.6% |
| 520nm | 33.0% |
| 540nm | 32.3% |
| 546nm | 32.0% |
| 560nm | 31.4% |
| 580nm | 30.6% |
| 589nm | 30.1% |
| 600nm | 29.7% |
| 620nm | 29.0% |
| 640nm | 28.3% |
| 650nm | 28.1% |
| 660nm | 28.0% |
| 680nm | 28.0% |
| 700nm | 28.4% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 34.4%.
Colour in reflected light:
Gray with a slight bluish tint compared to clausthalite. Hematite appears distinctly bluer. Dark gray when immersed, but with thin cobalt-rich zones of cream-gray color.
Comments:
Nickel rich material can have reflectivities about 5% higher.
Chemistry of Krut'aite
Mindat Formula:
CuSe2
Elements listed:
Common Impurities:
Co,Ni,Fe,Hg
Crystallography of Krut'aite
Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Pa3
Cell Parameters:
a = 6.06 Å
Unit Cell V:
222.55 ų (Calculated from Unit Cell)
Z:
4
Comment:
Pa-3
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.712 Å | (100) |
| 3.023 Å | (90) |
| 2.477 Å | (80) |
| 1.827 Å | (60) |
| 1.678 Å | (40) |
| 1.166 Å | (40) |
| 1.618 Å | (30) |
Comments:
Petrovice, Czech Republic. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Krut'aite
General Appearance of Type Material:
As grains to a few tenths of a millimeter. Most often as hypidiomorphic crystals, included in clausthalite.
Place of Conservation of Type Material:
École Nationale Supérieure des Mines, Paris, France, number 50853 (holotype).
Geological Setting of Type Material:
Hydrothermal.
Associated Minerals at Type Locality:
Synonyms of Krut'aite
Other Language Names for Krut'aite
Relationship of Krut'aite to other Species
Member of:
Other Members of this group:
| Aurostibite | AuSb2 | Iso. m3 (2/m 3) : Pa3 |
| Cattierite | CoS2 | Iso. m3 (2/m 3) : Pa3 |
| Dzharkenite | FeSe2 | Iso. m3 (2/m 3) : Pa3 |
| Erlichmanite | OsS2 | Iso. m3 (2/m 3) : Pa3 |
| Fukuchilite | Cu3FeS8 | Iso. m3 (2/m 3) : Pa3 |
| Gaotaiite | Ir3Te8 | Iso. m3 (2/m 3) : Pa3 |
| Geversite | PtSb2 | Iso. m3 (2/m 3) : Pa3 |
| Hauerite | MnS2 | Iso. m3 (2/m 3) : Pa3 |
| Insizwaite | Pt(Bi,Sb)2 | Iso. m3 (2/m 3) : Pa3 |
| Laurite | RuS2 | Iso. m3 (2/m 3) : Pa3 |
| Penroseite | (Ni,Co,Cu)Se2 | Iso. m3 (2/m 3) : Pa3 |
| Pyrite | FeS2 | Iso. m3 (2/m 3) : Pa3 |
| Sperrylite | PtAs2 | Iso. m3 (2/m 3) : Pa3 |
| Trogtalite | CoSe2 | Iso. m3 (2/m 3) : Pa3 |
| Vaesite | NiS2 | Iso. m3 (2/m 3) : Pa3 |
| Villamanínite | (Cu,Ni,Co,Fe)S2 | Tric. |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 79 photos of Krut'aite associated with Clausthalite | PbSe |
| 59 photos of Krut'aite associated with Penroseite | (Ni,Co,Cu)Se2 |
| 59 photos of Krut'aite associated with Klockmannite | CuSe |
| 40 photos of Krut'aite associated with Goethite | α-Fe3+O(OH) |
| 32 photos of Krut'aite associated with Chalcopyrite | CuFeS2 |
| 23 photos of Krut'aite associated with Watkinsonite | Cu2PbBi4(Se,S,Te)8 |
| 20 photos of Krut'aite associated with Petrovicite | Cu3HgPbBiSe5 |
| 20 photos of Krut'aite associated with Eldragónite | Cu6BiSe4(Se2) |
| 19 photos of Krut'aite associated with Chalcomenite | CuSeO3 · 2H2O |
| 18 photos of Krut'aite associated with Umangite | Cu3Se2 |
Related Minerals - Strunz-mindat Grouping
| 2.EB. | Iridarsenite | (Ir,Ru)As2 |
| 2.EB. | Selenolaurite | RuSe2 |
| 2.EB. | Andrieslombaardite | RhSbS |
| 2.EB. | Kanatzidisite | (SbBiS3)2Te2 |
| 2.EB.05a | Aurostibite | AuSb2 |
| 2.EB.05b | Bambollaite | Cu(Se,Te)2 |
| 2.EB.05a | Cattierite | CoS2 |
| 2.EB.05a | Erlichmanite | OsS2 |
| 2.EB.05a | Fukuchilite | Cu3FeS8 |
| 2.EB.05a | Geversite | PtSb2 |
| 2.EB.05a | Hauerite | MnS2 |
| 2.EB.05a | Insizwaite | Pt(Bi,Sb)2 |
| 2.EB.05a | Laurite | RuS2 |
| 2.EB.05a | Penroseite | (Ni,Co,Cu)Se2 |
| 2.EB.05a | Pyrite | FeS2 |
| 2.EB.05a | Sperrylite | PtAs2 |
| 2.EB.05a | Trogtalite | CoSe2 |
| 2.EB.05a | Vaesite | NiS2 |
| 2.EB.05a | Villamanínite | (Cu,Ni,Co,Fe)S2 |
| 2.EB.05a | Dzharkenite | FeSe2 |
| 2.EB.05a | Gaotaiite | Ir3Te8 |
| 2.EB.05a v | Cayeuxite | |
| 2.EB.10b | Alloclasite | Co1-xFexAsS |
| 2.EB.10d | Costibite | CoSbS |
| 2.EB.10a | Ferroselite | FeSe2 |
| 2.EB.10a | Frohbergite | FeTe2 |
| 2.EB.10c | Glaucodot | (Co0.50Fe0.50)AsS |
| 2.EB.10a | Kullerudite | NiSe2 |
| 2.EB.10a | Marcasite | FeS2 |
| 2.EB.10a | Mattagamite | CoTe2 |
| 2.EB.10e | Paracostibite | CoSbS |
| 2.EB.10e | Pararammelsbergite | NiAs2 |
| 2.EB.10f | Oenite | CoSbAs |
| 2.EB.10a | Petříčekite | CuSe2 |
| 2.EB.15a | Anduoite | (Ru,Os)As2 |
| 2.EB.15a | Clinosafflorite | CoAs2 |
| 2.EB.15a | Löllingite | FeAs2 |
| 2.EB.15a | Nisbite | NiSb2 |
| 2.EB.15a | Omeiite | (Os,Ru)As2 |
| 2.EB.15c | Paxite | CuAs2 |
| 2.EB.15a | Rammelsbergite | NiAs2 |
| 2.EB.15a | Safflorite | (Co,Ni,Fe)As2 |
| 2.EB.15b | Seinäjokite | (Fe,Ni)(Sb,As)2 |
| 2.EB.20 | Arsenopyrite | FeAsS |
| 2.EB.20 | Gudmundite | FeSbS |
| 2.EB.20 | Osarsite | (Os,Ru)AsS |
| 2.EB.20 | Ruarsite | (Ru,Os)AsS |
| 2.EB.25 va | Antimony-bearing Gersdorffite | Ni(As,Sb)S |
| 2.EB.25 | Cobaltite | CoAsS |
| 2.EB.25 | Gersdorffite | NiAsS |
| 2.EB.25 | Hollingworthite | (Rh,Pt,Pd)AsS |
| 2.EB.25 | Irarsite | (Ir,Ru,Rh,Pt)AsS |
| 2.EB.25 | Jolliffeite | NiAsSe |
| 2.EB.25 | Krutovite | NiAs2 |
| 2.EB.25 | Maslovite | PtBiTe |
| 2.EB.25 | Michenerite | PdBiTe |
| 2.EB.25 | Padmaite | PdBiSe |
| 2.EB.25 | Platarsite | Pt(As,S)2 |
| 2.EB.25 | Testibiopalladite | PdSbTe |
| 2.EB.25 | Tolovkite | IrSbS |
| 2.EB.25 | Ullmannite | NiSbS |
| 2.EB.25 | Willyamite | CoSbS |
| 2.EB.25 | Changchengite | IrBiS |
| 2.EB.25 | Mayingite | IrBiTe |
| 2.EB.25 | Kalungaite | PdAsSe |
| 2.EB.25 | Milotaite | PdSbSe |
| 2.EB.25 | Paragersdorffite | Ni(As,S)2 |
| 2.EB.25 | Orthogersdorffite | NiAsS |
| 2.EB.25 | Kvačekite | NiSbSe |
| 2.EB.30 | Urvantsevite | Pd(Bi,Pb)2 |
| 2.EB.35 | Rheniite | ReS2 |
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 Krut'aite
mindat.org URL:
https://www.mindat.org/min-2279.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Krut'aite
Reference List:
Johan, Zdenek, Picot, Paul, Pierrot, Roland, Kvacek, Milan (1972) La krutaïte, CuSe2, un nouveau minéral du groupe de la pyrite. Bulletin de Minéralogie, 95 (4) 475-481 doi:10.3406/bulmi.1972.6712
Criddle, A. J., Stanley, C. J. (1993) Data file. In Quantitative Data File for Ore Minerals. Springer Netherlands. p.1-635. doi:10.1007/978-94-011-1486-8_1p.303
Localities for Krut'aite
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.
Argentina | |
| Milka K. de Brodtkorb (2002) |
| Paar (1996) | |
| pers. comm. Frank Keutsch (ID: SEM/EDS refl. light) +1 other reference |
| Bindi et al. (2016) +1 other reference |
Bolivia | |
| doi:10.3390/min7050068 +2 other references |
Brazil | |
| Menez +3 other references |
| Berni et al. (2016) |
China | |
| Zhu +10 other references |
| Dai et al. (2015) |
Czech Republic | |
| Bindi et al. (2016) |
| Kvaček +1 other reference |
Germany | |
| Wittern (2001) |
Jordan | |
| Pitty et al. (2010) |
USA | |
| Adams (2016) +1 other reference |
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El Dragón mine, Porco Municipality, Antonio Quijarro Province, Potosí, Bolivia