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
GUID
(UUID V4):
(UUID V4):
b231adca-d647-439e-8792-741a827543d5
Classification of Palladoarsenide
Approved
First published:
1974
Type description reference:
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 IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Pda | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC 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). Top of box is 100%. Peak reflectance is 59.2%.
R1 shown in black, R2 shown in red
Chemical Properties of Palladoarsenide
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 Ă
Âł (Calculated from Unit Cell)
Z:
18
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.14 Ă | (100) |
2.21 Ă | (90) |
2.60 Ă | (70) |
1.955 Ă | (70) |
2.35 Ă | (60) |
2.31 Ă | (60) |
2.13 Ă | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
26 : Hadean detrital minerals | |
High-đ 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 CuâNi sulfide deposit; also within heavy mineral concentrates
Associated Minerals at Type Locality:
Reference:
Begizov, V.D., Meshichankina, V.I., Dubakina, L.S. (1974) Palladoarsenide, Pd2As, a new natural palladium arsenide from the copper-nickel deposits of the Oktyabr deposits. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 103(1): 104-107.
Synonyms of Palladoarsenide
Other Language Names for Palladoarsenide
German:Palladoarsenid
Simplified Chinese:æç ·éŻçż
Common Associates
Associated Minerals 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 Cherepanovite | RhAs |
1 photo of Palladoarsenide associated with Isoferroplatinum | Pt3Fe |
1 photo of Palladoarsenide associated with Platinum-Group Elements | |
1 photo of Palladoarsenide associated with Platinum | Pt |
1 photo of Palladoarsenide associated with Irarsite | (Ir,Ru,Rh,Pt)AsS |
1 photo of Palladoarsenide associated with Törnroosite | Pd11As2Te2 |
1 photo of Palladoarsenide associated with Sperrylite | PtAs2 |
Related Minerals - Strunz-mindat Grouping
2.AC. | Törnroosite | Pd11As2Te2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.05a | Atheneite | Pd2As0.75Hg0.25 | Hex. 6 m2 : P62m |
2.AC.05b | Vincentite | Pd3As | Mon. |
2.AC.10c | Arsenopalladinite | Pd8(As,Sb)3 | Tric. 1 : P1 |
2.AC.10b | Mertieite | Pd8Sb2.5As0.5 | Trig. 3m (3 2/m) : R3c |
2.AC.10a | Stillwaterite | Pd8As3 | Trig. |
2.AC.15a | Isomertieite | Pd11Sb2As2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 | Hex. |
2.AC.15a | Miessiite | Pd11Te2Se2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.20b | Palarstanide | Pd5(Sn,As)2 | Hex. |
2.AC.20a | Stibiopalladinite | Pd5Sb2 | Hex. |
2.AC.20c | Menshikovite | Pd3Ni2As3 | Hex. 6/m : P63/m |
2.AC.25e | Majakite | PdNiAs | Hex. |
2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) | Orth. |
2.AC.25c | Palladodymite | (Pd,Rh)2As | Orth. mmm (2/m 2/m 2/m) : Pnma |
2.AC.25b | Rhodarsenide | (Rh,Pd)2As | Orth. |
2.AC.25d | Naldrettite | Pd2Sb | Orth. mm2 : Cmc21 |
2.AC.30 | UM1999-02-As:NiRh | (Rh,Ni)7As4 | |
2.AC.30 | Polkanovite | Rh12As7 | Hex. 6/m : P63/m |
2.AC.35a | Genkinite | Pt4Sb3 | Tet. 4 2 2 |
2.AC.35b | Ungavaite | Pd4Sb3 | Tet. 4 2 2 : P41 21 2 |
2.AC.40 | Polarite | Pd(Bi,Pb) | Orth. mm2 : Cmc21 |
2.AC.45a | Froodite | α-PdBi2 | Mon. 2/m : B2/m |
2.AC.50 | Nipalarsite | Ni8Pd3As4 | Iso. m3m (4/m 3 2/m) |
2.AC.50 | Viteite | Pd5InAs | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
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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Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Palladoarsenide
Reference List:
Localities for Palladoarsenide
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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Quick NavTopAbout PalladoarsenideUnique IdentifiersClassification Mineral SymbolsPhysical Properties Optical Data Chemical Properties Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Maandagshoek farm, Burgersfort, Fetakgomo Tubatse Local Municipality, Sekhukhune District Municipality, Limpopo, South Africa