Polkanovite
A valid IMA mineral species
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About Polkanovite
Formula:
Rh12As7
Lustre:
Metallic
Specific Gravity:
10.20 (Calculated)
Crystal System:
Hexagonal
Name:
Named after Yuri Aleksandrovich Polkanov (Юрий Александрович Полканов) (b. 10 March 1935, Simferopol, USSR), Academician, Institute of Mineral Resources, Academy of Technical Sciences of Ukraine, known for his studies of the mineralogy and ore deposits of the Crimean Peninsula, and particularly of placers.
Type Locality:
This page provides mineralogical data about Polkanovite.
Unique Identifiers
Mindat ID:
7240
Long-form identifier:
mindat:1:1:7240:9
IMA Classification of Polkanovite
Approved
Approval year:
1997
First published:
1998
Classification of Polkanovite
2.AC.30
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
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 for Standard |
|---|---|---|
| Pkv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Plk | 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 Polkanovite
Metallic
Transparency:
Opaque
Hardness:
VHN40=399 - 422 kg/mm2 - Vickers
Cleavage:
None Observed
Parting:
None observed
Density:
10.20 g/cm3 (Calculated)
Optical Data of Polkanovite
Anisotropism:
Weak, gray to brownish-gray
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 420nm | 49.2% | 44.9% |
| 440nm | 47.9% | 44.2% |
| 460nm | 47.5% | 43.9% |
| 480nm | 47.8% | 44.5% |
| 500nm | 48.0% | 44.8% |
| 520nm | 48.1% | 44.5% |
| 540nm | 48.3% | 44.7% |
| 560nm | 48.8% | 45.6% |
| 580nm | 49.2% | 46.4% |
| 600nm | 49.7% | 46.9% |
| 620nm | 50.7% | 47.1% |
| 640nm | 51.3% | 47.8% |
| 660nm | 51.3% | 48.6% |
| 680nm | 51.6% | 49.1% |
| 700nm | 51.9% | 49.5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 51.9%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Brownish-gray
Chemistry of Polkanovite
Mindat Formula:
Rh12As7
Elements listed:
Crystallography of Polkanovite
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 9.31(2) Å, c = 3.64(2) Å
Ratio:
a:c = 1 : 0.391
Unit Cell V:
273.23 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0014153 | Polkanovite | Lambert-Andron B, Dhahri E, Chaudouet P, Madar R (1985) Crystal structure of Rh12As7 Journal of the Less-Common Metals 108 353-358 | 1985 | synthetic | 0 | 293 | |
| 0014151 | Polkanovite | Pivan J Y, Guerin R, Sergent M (1985) Rh12As7, a host structure for rare earth elements: Crystal structures of Rh12As7 and Ho2Rh12As7 Journal of the Less-Common Metals 107 249-258 | 1985 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 1.755 Å | (100) |
| 1.852 Å | (90) |
| 1.549 Å | (80) |
| 1.767 Å | (60) |
| 2.33 Å | (40) |
| 2.03 Å | (20) |
| 1.818 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 7 : Ultramafic igneous rocks | |
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 38 : Ophiolites |
Type Occurrence of Polkanovite
General Appearance of Type Material:
Irregular inclusions up to 45x140 um.
Place of Conservation of Type Material:
Mining Museum, Saint Petersburg Mining Institute, Russia (3073/1).
Associated Minerals at Type Locality:
Synonyms of Polkanovite
Other Language Names for Polkanovite
Common Associates
Associations Based on Photo Data:
| 2 photos of Polkanovite associated with Native Ruthenium | (Ru,Ir) |
| 1 photo of Polkanovite associated with Cherepanovite | RhAs |
| 1 photo of Polkanovite associated with Isoferroplatinum | Pt3Fe |
Related Minerals - Strunz-mindat Grouping
| 2.AC. | Vadlazarenkovite | Pd8Bi1.5Te1.25As0.25 |
| 2.AC. | Törnroosite | Pd11As2Te2 |
| 2.AC.05b | Vincentite | Pd3As |
| 2.AC.05a | Atheneite | Pd2As0.75Hg0.25 |
| 2.AC.10c | Arsenopalladinite | Pd8(As,Sb)3 |
| 2.AC.10b | Mertieite | Pd8Sb2.5As0.5 |
| 2.AC.10a | Stillwaterite | Pd8As3 |
| 2.AC.15a | Isomertieite | Pd11Sb2As2 |
| 2.AC.15a | Miessiite | Pd11Te2Se2 |
| 2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 |
| 2.AC.20c | Menshikovite | Pd3Ni2As3 |
| 2.AC.20a | Stibiopalladinite | Pd5Sb2 |
| 2.AC.20b | Palarstanide | Pd5(Sn,As)2 |
| 2.AC.25c | Palladodymite | (Pd,Rh)2As |
| 2.AC.25d | Naldrettite | Pd2Sb |
| 2.AC.25b | Rhodarsenide | (Rh,Pd)2As |
| 2.AC.25e | Majakite | PdNiAs |
| 2.AC.25a | Palladoarsenide | Pd2As |
| 2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) |
| 2.AC.30 | 'UM1999-02-As:NiRh' | (Rh,Ni)7As4 |
| 2.AC.35b | Ungavaite | Pd4Sb3 |
| 2.AC.35a | Genkinite | Pt4Sb3 |
| 2.AC.40 | Polarite | Pd(Bi,Pb) |
| 2.AC.45a | Froodite | α-PdBi2 |
| 2.AC.50 | Viteite | Pd5InAs |
| 2.AC.50 | Nipalarsite | Ni8Pd3As4 |
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 Polkanovite
mindat.org URL:
https://www.mindat.org/min-7240.html
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References for Polkanovite
Reference List:
Pivan, J.Y, Guérin, R, Sergent, M (1985) Rh12As7, a host structure for rare earth elements: Crystal structures of Rh12As7 and Ho2Rh12As7. Journal of the Less Common Metals, 107 (2). 249-258 doi:10.1016/0022-5088(85)90084-0
Lambert-Andron, B., Dhahri, E., Chaudoüet, P., Madar, R. (1985) Crystal structure of Rh12As7. Journal of the Less Common Metals, 108 (2). 353-358 doi:10.1016/0022-5088(85)90230-9
Localities for Polkanovite
Showing 7 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.
Canada | |
| N Farhangi |
China | |
| Bai et al. (2007) |
Japan | |
| NISHIO–HAMANE et al. (2022) |
| NISHIO–HAMANE et al. (2022) |
Russia (TL) | |
| Britvin et al. (1998) +1 other reference |
| Sidorov et al. (2004) |
| Sidorov et al. (2004) |
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Miass River, Chelyabinsk Oblast, Russia