Palladoarsenide
A valid IMA mineral species
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About Palladoarsenide
Formula:
Pd2As
Colour:
steel-gray
Lustre:
Metallic
Hardness:
5
Specific Gravity:
10.42 (Calculated)
Crystal System:
Monoclinic
Name:
Named for the composition.
Compare 'UM1974-01-As:PdSb', most likely an antimonian variety.
Also compare UM1975-07-As:PdSn, UM1976-01-As:BiPd, UM1976-03-As:NiPd, UM1974-01-As:PdSb, and very similar palladobismutharsenide.
Also compare UM1975-07-As:PdSn, UM1976-01-As:BiPd, UM1976-03-As:NiPd, UM1974-01-As:PdSb, and very similar palladobismutharsenide.
Unique Identifiers
Mindat ID:
3068
Long-form identifier:
mindat:1:1:3068:3
IMA Classification of Palladoarsenide
Approved
Approval year:
1973
First published:
1974
Classification of Palladoarsenide
2.AC.25a
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
2.4.14.1
2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
2 : SULFIDES
4 : AmBnXp, with (m+n):p = 2:1
3.12.24
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals
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 |
|---|---|---|
| Pda | 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 Palladoarsenide
Metallic
Transparency:
Opaque
Colour:
Steel-gray
Comment:
in polished section (reflected light?): grayish white with slight rose tint
Hardness:
5 on Mohs scale
Hardness:
VHN20=277 - 357 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
2 directions
2 directions
Density:
10.42 g/cm3 (Calculated)
Optical Data of Palladoarsenide
Anisotropism:
moderate: dark gray with bluish tint to red-brown (air), dark gray to brownish gray with red tint (oil)
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 44.2% | 45.1% |
| 420nm | 46.8% | 46.8% |
| 440nm | 48.4% | 48.8% |
| 460nm | 49.4% | 50.3% |
| 480nm | 50.2% | 51.6% |
| 500nm | 51.2% | 53.1% |
| 520nm | 51.9% | 54.1% |
| 540nm | 52.5% | 54.8% |
| 560nm | 53.3% | 55.4% |
| 580nm | 53.9% | 55.8% |
| 600nm | 54.6% | 56.3% |
| 620nm | 55.4% | 57.1% |
| 640nm | 56.0% | 57.6% |
| 660nm | 56.6% | 58.1% |
| 680nm | 57.1% | 58.6% |
| 700nm | 57.8% | 59.2% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 59.2%.
R1 shown in black, R2 shown in red
Chemistry of Palladoarsenide
Mindat Formula:
Pd2As
Elements listed:
Common Impurities:
Pt,Au,Ag,Ni,Cu,Sb,Te
Crystallography of Palladoarsenide
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
Cell Parameters:
a = 9.25(1) Å, b = 8.47(2) Å, c = 10.44(2) Å
β = 94.0°
β = 94.0°
Ratio:
a:b:c = 1.092 : 1 : 1.233
Unit Cell V:
815.96 ų (Calculated from Unit Cell)
Z:
18
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.14 Å | (100) |
| 2.21 Å | (90) |
| 2.60 Å | (70) |
| 1.955 Å | (70) |
| 2.35 Å | (60) |
| 2.31 Å | (60) |
| 2.13 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| 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 |
| 37 : Layered igneous intrusions and related PGE minerals |
Type Occurrence of Palladoarsenide
General Appearance of Type Material:
irregular grains in chalcopyrite, up to 0.4 mm, long & veinlet-like, vermicular, having curving boundaries
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
veins along the footwall of a Cu–Ni sulfide deposit; also within heavy mineral concentrates
Associated Minerals at Type Locality:
Synonyms of Palladoarsenide
Other Language Names for Palladoarsenide
German:Palladoarsenid
Simplified Chinese:斜砷钯矿
Common Associates
Associations Based on Photo Data:
| 5 photos of Palladoarsenide associated with Hollingworthite | (Rh,Pt,Pd)AsS |
| 5 photos of Palladoarsenide associated with Gersdorffite | NiAsS |
| 1 photo of Palladoarsenide associated with Atokite | (Pd,Pt)3Sn |
| 1 photo of Palladoarsenide associated with 'Electrum' | (Au,Ag) |
| 1 photo of Palladoarsenide associated with Palarstanide | Pd5(Sn,As)2 |
| 1 photo of Palladoarsenide associated with Sperrylite | PtAs2 |
| 1 photo of Palladoarsenide associated with Palladinite | PdO |
| 1 photo of Palladoarsenide associated with Irarsite | (Ir,Ru,Rh,Pt)AsS |
| 1 photo of Palladoarsenide associated with Laurite | RuS2 |
| 1 photo of Palladoarsenide associated with Chalcopyrite | CuFeS2 |
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.25f | Palladobismutharsenide | Pd2(As,Bi) |
| 2.AC.30 | 'UM1999-02-As:NiRh' | (Rh,Ni)7As4 |
| 2.AC.30 | Polkanovite | Rh12As7 |
| 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 Palladoarsenide
mindat.org URL:
https://www.mindat.org/min-3068.html
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References for Palladoarsenide
Reference List:
Bälz, U., Schubert, K. (1969) Kristallstruktur von Pd2As(r) und Pd2Sb. Journal of the Less Common Metals, 19 (3). 300-304 doi:10.1016/0022-5088(69)90111-8
Localities for Palladoarsenide
Showing 58 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.
Australia | |
| Econ Geol (1986) |
Austria | |
| K. N. Malitch. (2001) |
Bulgaria | |
| Strashimirov et al. (2002) +2 other references |
Canada | |
| N Farhangi |
| McDonald et al. (2015) +1 other reference |
| Good et al. (2017) | |
| Caglioti (2023) | |
| Cabri et al. (1979) |
| TALKINGTON et al. (1984) | |
| Ohnenstetter et al. (1991) |
| Wilson et al. (2013) |
| Good et al. (2017) |
Ecuador | |
| Barron et al. (2025) |
Finland | |
| Alapieti et al. (1986) |
| Iljina (1994) |
| Papunen (1986) | |
| Törmänen +2 other references |
France | |
| Ducluzaux (2022) |
| Ducluzaux (2022) |
| Ducluzaux (2021) |
Greece | |
| Kapsiotis (2013) |
India | |
| Devaraju et al. (2005) |
Japan | |
| NISHIO–HAMANE et al. (2022) |
| NISHIO–HAMANE et al. (2022) |
Madagascar | |
| McDonald et al. (1999) |
Norway | |
| Nilsson et al. (1998) |
Oman | |
| Ahmed et al. (2003) |
Russia | |
| Barkov et al. (2023) |
| - (2014) +2 other references |
| Gritsenko et al. (2022) | |
| Begizov et al. (1974) +1 other reference |
| Spiridonov et al. (2011) | |
| Sluzhenikin et al. (2014) | |
| 2014 Ultramafic-mafic intrusions | |
| Kalugin et al. (2021) | |
| 33rd International Geological Congress (2008) |
| Groshev +7 other references | |
| Groshev +6 other references | |
| Groshev +7 other references | |
| 33rd International Geological Congress (2008) | |
| Grokhovskaya et al. (2009) |
| - (2014) |
| Y.A. et al. (2019) |
| Chashchin et al. (2013) | |
| Chashchin et al. (2013) | |
| - (2014) |
| Grishaenko et al. (2007) |
South Africa | |
| McCreesh et al. (2018) |
| Montjoie (2018) |
| Melcher et al. (2005) | |
| Yudovskaya et al. (2011) |
| Holwell et al. (2006) +1 other reference |
| Smith et al. (2013) |
USA | |
| Volborth et al. (1986) |
| Volborth et al. (1986) |
| Volborth et al. (1986) | |
| Gobla (2012) | |
| Smith and Barnes (2011) |
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Maandagshoek Farm, Fetakgomo Tubatse Local Municipality, Sekhukhune District Municipality, Limpopo, South Africa