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Rhodarsenide

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Formula:
(Rh,Pd)2As
Lustre:
Metallic
Hardness:
4 - 5
Specific Gravity:
11.32 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after its chemical composition of rhodium and arsenic.
This page provides mineralogical data about Rhodarsenide.


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Classification of RhodarsenideHide

Approved
2/A.05-105
2.AC.25b

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE

Physical Properties of RhodarsenideHide

Metallic
Transparency:
Opaque
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN25=515 kg/mm2 - Vickers
Density:
11.32 g/cm3 (Calculated)

Optical Data of RhodarsenideHide

Type:
Anisotropic
Anisotropism:
moderate from dark brown to greenish grey
Colour in reflected light:
brownish with a pale-green tinge.
Pleochroism:
Weak
Comments:
brownish to greenish in oil

Chemical Properties of RhodarsenideHide

Formula:
(Rh,Pd)2As
IMA Formula:
Rh2As

Crystallography of RhodarsenideHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 5.866(5) Å, b = 3.893(2) Å, c = 7.302(4) Å
Ratio:
a:b:c = 1.507 : 1 : 1.876
Unit Cell V:
166.75 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.237 (10)
2.067 (8)
2.426 (7)

Occurrences of RhodarsenideHide

Paragenetic Mode(s):

Type Occurrence of RhodarsenideHide

General Appearance of Type Material:
irregular inclusions
Place of Conservation of Type Material:
Mineralogical Museum of the University of Hamburg,
Geological Setting of Type Material:
placer platinum deposits derived from chromites in ophiolite complex
Associated Minerals at Type Locality:

Synonyms of RhodarsenideHide

Other Language Names for RhodarsenideHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Osmium1 photo of Rhodarsenide associated with Osmium on mindat.org.
Isoferroplatinum1 photo of Rhodarsenide associated with Isoferroplatinum on mindat.org.
Hongshiite1 photo of Rhodarsenide associated with Hongshiite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.AC.05aAtheneitePd2As0.75Hg0.25Hex. 6 m2 : P62m
2.AC.05bVincentitePd3AsTet.
2.AC.10cArsenopalladinitePd8(As,Sb)3Tric. 1 : P1
2.AC.10bMertieite-IIPd8(Sb,As)3Trig.
2.AC.10aStillwateritePd8As3Trig.
2.AC.15aIsomertieitePd11Sb2As2Iso. m3m (4/m 3 2/m) : Fd3m
2.AC.15bMertieite-IPd11(Sb,As)4Hex.
2.AC.15aMiessiitePd11Te2Se2Iso. m3m (4/m 3 2/m) : Fd3m
2.AC.20bPalarstanidePd5(Sn,As)2Hex.
2.AC.20aStibiopalladinitePd5Sb2Hex.
2.AC.20cMenshikovitePd3Ni2As3Hex. 6/m : P63/m
2.AC.25eMajakitePdNiAsHex.
2.AC.25aPalladoarsenidePd2AsMon. 2/m : P2/m
2.AC.25fPalladobismutharsenidePd2(As,Bi)Orth.
2.AC.25cPalladodymite(Pd,Rh)2AsOrth.
2.AC.25dNaldrettitePd2SbOrth. mm2 : Cmc21
2.AC.30UM1999-02-As:NiRh(Rh,Ni)7As4
2.AC.30PolkanoviteRh12As7Hex.
2.AC.35aGenkinite(Pt,Pd,Rh)4Sb3Tet. 4 2 2
2.AC.35bUngavaitePd4Sb3Tet. 4 2 2 : P41 21 2
2.AC.40PolaritePd(Bi,Pb)Orth. mm2 : Cmc21
2.AC.45cBorishanskiitePd1+x(As,Pb)2 , x = 0-0.2Orth. mm2
2.AC.45aFrooditeα-PdBi2Mon. 2/m : B2/m
2.AC.45bIridarsenite(Ir,Ru)As2Mon.

Other InformationHide

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 RhodarsenideHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 29: 476.
Tarkian M, Krstic S, Klaska K-H, Ließmann W (1997) Rhodarsenide, (Rh,Pd)2As, a new mineral. European Journal of Mineralogy 9, 1321-1325

Internet Links for RhodarsenideHide

Localities for RhodarsenideHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Ontario
    • 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.
Russia
 
  • Far-Eastern Region
    • Chukotskii Autonomous Okrug
      • Kolyma area
        • Bol'shoi Anyui River Basin
          • Baimka River
            • Aluchinskii Massif (Aluchin horst)
Gornostayev, S.S., Crocket, J.H., Mochalov, A.G., and Lajoki, K.V.O. (1999) The platinum-group minerals of the Baimka placer deposits, Aluchin horst, Russian Far East. Canadian Mineralogist: 37: 1117-1129.
    • Kamchatka Oblast'
Sidorov, E. G., Tolstykh, N. D., Podlipsky, M. Y., & Pakhomov, I. O. (2004). Placer PGE minerals from the Filippa clinopyroxenite-dunite massif (Kamchatka). Geologiya i Geofizika (Russian Geology and Geophysics), 45(9), 1128-1144.
[Canadian Mineralogist 38 p1251-1264 "The association of platinum-group minerals in placers of the Pustaya River, Kamchatka, Russia"]
Serbia (TL)
 
  • Rasina District
    • Trstenik
      • Veluće
Tarkian M, Krstic S, Klaska K-H, Ließmann W (1997) Rhodarsenide, (Rh,Pd)2As, a new mineral. European Journal of Mineralogy 9, 1321-1325
South Africa
 
  • Limpopo Province
    • Bushveld Complex
The Canadian Mineralogist Vol. 43, pp. 1711-1734 (2005)
Mineral and/or Locality  
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