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Palladoarsenide

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Formula:
Pd2As
System:
Monoclinic
Colour:
steel-gray
Hardness:
5
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.

Classification of Palladoarsenide

Approved
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
2.4.14.1

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
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http://www.mindat.org/min-3068.html
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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
Year of Discovery:
1974
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:

Physical Properties of Palladoarsenide

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
steel-gray
Comment:
in polished section (reflected light?): grayish white with slight rose tint
Hardness (Mohs):
5
Hardness (Vickers):
VHN20=277 - 357 kg/mm2
Tenacity:
Brittle
Cleavage:
Perfect
2 directions
Density:
10.42 g/cm3 (Calculated)

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°
Ratio:
a:b:c = 1.092 : 1 : 1.233
Unit Cell Volume:
V 815.96 ų (Calculated from Unit Cell)
Z:
18
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.14 (100)
2.21 (90)
2.60 (70)
1.955 (70)
2.35 (60)
2.31 (60)
2.13 (50)

Optical Data of Palladoarsenide

Type:
Anisotropic
Anisotropism:
moderate: dark gray with bluish tint to red-brown (air), dark gray to brownish gray with red tint (oil)
Reflectivity:
400nmR1=44.2%R2=45.1%
420nmR1=46.8%R2=46.8%
440nmR1=48.4%R2=48.8%
460nmR1=49.4%R2=50.3%
480nmR1=50.2%R2=51.6%
500nmR1=51.2%R2=53.1%
520nmR1=51.9%R2=54.1%
nmR1=52.5%R2=54.8%
560nmR1=40 (53.3%R2=55.4%
580nmR1=53.9%R2=55.8%
600nmR1=54.6%R2=56.3%
620nmR1=55.4%R2=57.1%
640nmR1=56.0%R2=57.6%
660nmR1=56.6%R2=58.1%
680nmR1=57.1%R2=58.6%
700nmR1=57.8%R2=59.2%

Reflectance graph
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
All elements listed in formula:
Analytical Data:
Electron microprobe, wt.%, Komsomol'skii mine, Russia / Stillwater Complex, USA
Pd 67.8 / 74.0
Pt - / 0.10
Au 1.5 / 0.11
Ag 3.5 / n.d.
Cu - / 0.34
As 26.0 / 24.4
Te - / 1.3

total 98.8 / 100.25
Empirical Formula:
(Pd1.87Ag0.09Au0.02)Σ1.98As1.02 / (Pd2.01Cu0.02)Σ2.03(As0.94Te0.03)Σ0.97
Common Impurities:
Pt,Au,Ag,Ni,Cu,Sb,Te

Relationship of Palladoarsenide to other Species

2.AC.05aAtheneitePd2As0.75Hg0.25
2.AC.05bVincentitePd3As
2.AC.10cArsenopalladinitePd8(As,Sb)3
2.AC.10bMertieite-IIPd8(Sb,As)3
2.AC.10aStillwateritePd8As3
2.AC.15aIsomertieitePd11Sb2As2
2.AC.15bMertieite-IPd11(Sb,As)4
2.AC.15aMiessiitePd11Te2Se2
2.AC.20bPalarstanidePd5(Sn,As)2
2.AC.20aStibiopalladinitePd5Sb2
2.AC.20cMenshikovitePd3Ni2As3
2.AC.25eMajakitePdNiAs
2.AC.25fPalladobismutharsenidePd2(As,Bi)
2.AC.25cPalladodymite(Pd,Rh)2As
2.AC.25bRhodarsenide(Rh,Pd)2As
2.AC.25dNaldrettitePd2Sb
2.AC.30UM1999-02-As:NiRh(Rh,Ni)7As4
2.AC.30PolkanoviteRh12As7
2.AC.35aGenkinite(Pt,Pd,Rh)4Sb3
2.AC.35bUngavaitePd4Sb3
2.AC.40PolaritePd(Bi,Pb)
2.AC.45cBorishanskiitePd1+x(As,Pb)2 , x = 0-0.2
2.AC.45aFrooditeα-PdBi2
2.AC.45bIridarsenite(Ir,Ru)As2
3.12.1Seinäjokite(Fe,Ni)(Sb,As)2
3.12.2LauriteRuS2
3.12.3Ruthenarsenite(Ru,Ni)As
3.12.4Anduoite(Ru,Os)As2
3.12.5Ruarsite(Ru,Os)AsS
3.12.6Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4
3.12.7RhodplumsiteRh3Pb2S2
3.12.8Cuprorhodsite(Cu,Fe)Rh2S4
3.12.9KonderiteCu3Pb(Rh,Pt,Ir)8S16
3.12.10Bowieite(Rh,Ir,Pt)2S3
3.12.11CherepanoviteRhAs
3.12.12Hollingworthite(Rh,Pt,Pd)AsS
3.12.13Vysotskite(Pd,Ni)S
3.12.14Vasilite(Pd,Cu)16(S,Te)7
3.12.15PalladseitePd17Se15
3.12.16Oosterboschite(Pd,Cu)7Se5
3.12.17TelluropalladinitePd9Te4
3.12.18TemagamitePd3HgTe3
3.12.19SopcheiteAg4Pd3Te4
3.12.20MicheneritePdBiTe
3.12.21KotulskitePd(Te,Bi)
3.12.22Telargpalite(Pd,Ag)3(Te,Bi)
3.12.23Merenskyite(Pd,Pt)(Te,Bi)2
3.12.25StillwateritePd8As3
3.12.26AtheneitePd2As0.75Hg0.25
3.12.27MajakitePdNiAs
3.12.28PalarstanidePd5(Sn,As)2
3.12.29ArsenopalladinitePd8(As,Sb)3
3.12.30VincentitePd3As
3.12.31PalladobismutharsenidePd2(As,Bi)
3.12.32StibiopalladinitePd5Sb2
3.12.33Hexatestibiopanickelite(Pd,Ni)(Sb,Te)
3.12.34Sudburyite(Pd,Ni)Sb
3.12.35TestibiopalladitePdTe(Sb,Te)
3.12.36BorovskitePd3SbTe4
3.12.37IsomertieitePd11Sb2As2
3.12.38Mertieite-IPd11(Sb,As)4
3.12.39Mertieite-IIPd8(Sb,As)3
3.12.40SobolevskitePd(Bi,Te)
3.12.41Frooditeα-PdBi2
3.12.42PolaritePd(Bi,Pb)
3.12.43UrvantsevitePd(Bi,Pb)2
3.12.44CooperitePtS
3.12.45Braggite(Pt,Pd,Ni)S
3.12.46Kharaelakhite(Cu,Pt,Pb,Fe,Ni)9S8
3.12.47MalaniteCu(Pt3+,Ir3+)2S4
3.12.48Moncheite(Pt,Pd)(Te,Bi)2
3.12.49MaslovitePtBiTe
3.12.50SperrylitePtAs2
3.12.51PlatarsitePtAsS
3.12.52GeversitePtSb2
3.12.53DaomaniteCuPtAsS2
3.12.54Genkinite(Pt,Pd,Rh)4Sb3
3.12.55StumpflitePt(Sb,Bi)
3.12.56InsizwaitePt(Bi,Sb)2
3.12.57ErlichmaniteOsS2
3.12.58Omeiite(Os,Ru)As2
3.12.59Osarsite(Os,Ru)AsS
3.12.60Kashinite(Ir,Rh)2S3
3.12.61InaglyiteCu3Pb(Ir,Pt)8S16
3.12.62Cuproiridsite(Cu,Fe)Ir2S4
3.12.63Iridarsenite(Ir,Ru)As2
3.12.64Irarsite(Ir,Ru,Rh,Pt)AsS
3.12.65TolovkiteIrSbS

Other Names for Palladoarsenide

Name in Other Languages:
Simplified Chinese:斜砷钯矿

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.

References for Palladoarsenide

Reference List:
Bälz, U. and Schubert, K. (1969) Kristallstruktur von Pd2As(r) und Pd2Sb. Journal of Less-Common Metals: 19: 300-304.

American Mineralogist (1975): 60: 162.

Canadian Mineralogist (1975): 13: 321-335.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 103: 104-107.

Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se/Valid2009_03.pdf (2016) (concerns UM1974-01-As:PdSb)

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016

Internet Links for Palladoarsenide

Localities for Palladoarsenide

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Western Australia
    • Coolgardie Shire
Econ Geol (1986) 81:1218-1225
Bulgaria
 
  • Sofiya Oblast (Sofia Oblast)
    • Zlatitsa Obshtina
      • Zlatitsa
Strashimirov, S., Petrunov, R., and Kanazirski, M. (2002): Mineralium Deposita 37, 587-598.; Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155.; Georgiev, Georgi (2008) A genetic model of the Elatsite porphyry copper deposit, Bulgaria. GEOCHEMISTRY, MINERALOGY AND PETROLOGY • SOFIA 46, 143-160.
Canada
 
  • Ontario
    • Kenora District
      • Ring of Fire
        • BMA527861 Area
N Farhangi,CM Lesher,and MG Houlé
    • Thunder Bay District
      • Coldwell complex
Mcdonald, A.M., Cabri, L.J., Stanley, C.J., Good, D.J., Redpath, J., Lane, G., Spratt, J. & Ames, D.E. (2015) Coldwellite, Pd3Ag2S, a new mineral species from the Marathon deposit, Coldwell complex, Ontario, Canada. Canadian Mineralogist 53, 1-13.
      • Lac des Iles Area
Louis J. Cabri and J.H. Gilles Laflamme (1979) Mineralogy of Samples from the Lac Des Iles Area, Ontario. Canmet Report 79-27
Canadian Mineralogist, Vol.22, pp. 125-136 (1984)
      • O'Neill Township
American Mineralogist, Volume 76, pages 1694-1700, 199l
Finland
 
  • Lapland Region
    • Penikat complex
Econ Geol (1986) 81:1126-1136
    • Portimo complex
Iljina, M. 1994. The Portimo Layered Igneous Complex - with emphasis on diverse sulphide and platinum-group element deposits. Acta Univ. Oul. A258, 1994
Econ Geol (1986) 81:1236-1241
India
 
  • Karnataka
    • Shimoga schist belt
T. T. Alapieti, T. C. Devaraju, R. J. Kaukonen (2005) Sem-eds Study of the Platinum-group Minerals in the PGE mineralized Hanumalapura Segment of the Layeredmafic-ultramafic Complex of Channagiri, Davangere District, Karnataka. Jour. Geol. Soc. India, 65:745-752.
Madagascar
 
  • Mahajanga Province (Majunga)
    • Betsiboka Region
      • Tsaratanàna District
        • Andriamena Commune
McDonald, I., Ohnenstetter, D., Ohnenstetter, M., and Vaughan, D.J. (1999): Palladium oxides in ultramafic complexes near Lavatrafo, western Andriamena, Madagascar. Mineralogical Magazine. 63: 345-352
Norway
 
  • Finnmark
    • Porsanger
Nilsson, L. P. & Larsen, R. B. (1998): Edle mineraler i mafiske og ultramafiske bergarter- en oppsummering av platina-gruppe mineraler (PGM) funnet i Norge i de senere år. Norsk Bergverksmuseum Skrift 14: 40-49
Oman
 
  • Al Buraymi Governorate
    • Northern Oman Ophiolite
Ahmed, A. H., & Arai, S. (2003). Platinum-group minerals in podiform chromitites of the Oman ophiolite. The Canadian Mineralogist, 41(3), 597-616.
Russia
 
  • Eastern-Siberian Region
    • Taymyrskiy Autonomous Okrug
      • Taimyr Peninsula
        • Putoran Plateau
(2014) 12th International Platinum Symposium p320
            • Talnakh Cu-Ni Deposit
ZVMO,(1974) 103, 104-107; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
No reference listed
2014 Ultramafic-mafic intrusions, volcanic rocks and PGE-Cu-Ni sulfide deposits of the Noril’sk Province, Polar Siberia . 12th International Platinum Symposium
  • Northern Region
    • Karelia Republic
      • Northern Karelia
        • Oulanka plutonic complex
          • Olanga River (Oulanka River)
Grishaenko, M. V. P., & Federation, R. (2007). Independent Report on the Shalozerskoe (Burakovsky), Lukkulaisvaara and Tsipringa Platinum, Palladium, Copper, Nickel Deposits in the Autonomous Republic of Karelia Russian Federation
(2014) 12th International Platinum Symposium p63
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Fedorovo-Pansky massif (Pana layered complex)
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
33rd International Geological Congress (2008) session MPM-04 Platinum-group mineralogy: Platinum-group minerals in the PGE deposit of the Fedorovo-Pansky layered intrusion, Kola Peninsula
        • Monche-Tundra
          • Monchegorsk
            • Monchegorsk Cu-Ni Deposit
(2014) 12th International Platinum Symposium p88
Chashchin, V. V., & Petrov, S. V. (2013). Low-sulfide PGE ore in the Volchetundra gabbro-anorthosite pluton, Kola Peninsula, Russia. Geology of Ore Deposits, 55(5), 357-382.
Chashchin, V. V., & Petrov, S. V. (2013). Low-sulfide PGE ore in the Volchetundra gabbro-anorthosite pluton, Kola Peninsula, Russia. Geology of Ore Deposits, 55(5), 357-382.
South Africa
 
  • Limpopo Province
    • Bushveld Complex
The Canadian Mineralogist Vol. 43, pp. 1711-1734 (2005)
      • Waterberg District
        • Mokopane (Potgietersrus)
Holwell, D. A., McDonald, I., & Armitage, P. E. B. (2006). Platinum-group mineral assemblages in the Platreef at the Sandsloot Mine, northern Bushveld Complex, South Africa. Mineralogical Magazine, 70(1), 83-101.; HOLWELL D.A., MCDONALD I. & ARMITAGE, P.E.B. (2006). Platinum-group mineral assemblages in the Platreef at the South Central Pit, Sandsloot Mine, northern Bushveld Complex, South Africa. Mineralogical Magazine, 70, 83-101.
  • North West Province
    • Bojanala Platinum District
      • Western Bushveld Complex
        • Rustenburg (Rustenburg District)
          • Royal Bafokeng
Smith, A. J. B., Viljoen, K. S., Schouwstra, R., Roberts, J., Schalkwyk, C., & Gutzmer, J. (2013). Geological variations in the Merensky Reef at Bafokeng Rasimone Platinum Mine and its influence on flotation performance. Minerals Engineering, 52, 155-168.
USA
 
  • Montana
    • Stillwater Co.
      • Nye
Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
Canadian Mineralogist Vol.24, pp. 329-346 (1986)
        • Blakely Creek
Canadian Mineralogist Vol.24, pp. 329-346 (1986)
Canadian Mineralogist Vol.24, pp. 329-346 (1986)
  • Pennsylvania
    • Chester Co.
      • State Line Chromite District
Smith and Barnes (2011) Pennsylvania Geology v. 41, no. 3/4.
Mineral and/or Locality  
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