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Rhodarsenide

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Formula:
Rh2As
System:
Orthorhombic
Lustre:
Metallic
Hardness:
4 - 5
Name:
Named after its chemical composition of rhodium and arsenic.
This page provides mineralogical data about Rhodarsenide.


Classification of Rhodarsenide

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 Rhodarsenide

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

Optical Data of Rhodarsenide

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 Rhodarsenide

IMA Formula:
Rh2As
Elements listed in formula:

Crystallography of Rhodarsenide

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 Volume:
V 166.75 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.237 (10)
2.067 (8)
2.426 (7)

Occurrences of Rhodarsenide

Paragenetic Mode(s):

Type Occurrence of Rhodarsenide

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:

Relationship of Rhodarsenide to other Species

2.AC.05aAtheneitePd2(As0.75Hg0.25)
2.AC.05bVincentitePd3As
2.AC.10cArsenopalladinitePd8As3
2.AC.10bMertieite-IIPd8(Sb,As)3
2.AC.10aStillwateritePd8As3
2.AC.15aIsomertieitePd11Sb2As2
2.AC.15bMertieite-IPd5+x(Sb,As)2-x (x=0.1-0.2)
2.AC.15aMiessiitePd11Te2Se2
2.AC.20bPalarstanidePd5(Sn,As)2
2.AC.20aStibiopalladinitePd5Sb2
2.AC.20cMenshikovitePd3Ni2As3
2.AC.25eMajakitePdNiAs
2.AC.25aPalladoarsenidePd2As
2.AC.25fPalladobismutharsenidePd2(As,Bi)
2.AC.25cPalladodymitePd2As
2.AC.25dNaldrettitePd2Sb
2.AC.30UM1999-02-As:NiRh(Rh,Ni)7As4
2.AC.30PolkanoviteRh12As7
2.AC.35aGenkinitePt4Sb3
2.AC.35bUngavaitePd4Sb3
2.AC.40PolaritePd(Bi,Pb)
2.AC.45cBorishanskiitePd1+x(As,Pb)2 (x=0-0.2)
2.AC.45aFrooditePdBi2
2.AC.45bIridarseniteIrAs2

Other Names for Rhodarsenide

Name in Other Languages:

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 Rhodarsenide

Reference List:
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 Rhodarsenide

mindat.org URL:
https://www.mindat.org/min-7270.html
Please feel free to link to this page.

Localities for Rhodarsenide

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.
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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