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Rhodarsenide

A valid IMA mineral species
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09019750017271928892039.jpg
Rhodarsenide, etc.

Miass River, Chelyabinsk Oblast, Russia
02812100017718870788721.jpg
Rhodarsenide, etc.

Koryak plateau, Russia
03422610017271928923837.jpg
Rhodarsenide, etc.

Unspecified gold placer, Uchalinsky District, Bashkortostan, Russia
09019750017271928892039.jpg
Rhodarsenide, etc.

Miass River, Chelyabinsk Oblast, Russia
00557910017697443664603.jpg
Rhodarsenide, etc.

Koryak plateau, Russia
06610050017718870783551.jpg
Rhodarsenide, etc.

Unspecified gold placer, Uchalinsky District, Bashkortostan, Russia
09019750017271928892039.jpg
Rhodarsenide, etc.

Miass River, Chelyabinsk Oblast, Russia
02812100017718870788721.jpg
Rhodarsenide, etc.

Koryak plateau, Russia
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About RhodarsenideHide

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.


Unique IdentifiersHide

Mindat ID:
7270
Long-form identifier:
mindat:1:1:7270:6

IMA Classification of RhodarsenideHide

Classification of RhodarsenideHide

Strunz-mindat (2026):
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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
RdaIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of RhodarsenideHide

Lustre:
Metallic
Transparency:
Opaque
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN25=493 - 585 kg/mm2 - Vickers
Density:
11.32 g/cm3 (Calculated)

Optical Data of RhodarsenideHide

Anisotropism:
moderate from dark brown to greenish grey
Reflectivity:
WavelengthR1 (%)R2 (%)
470nm38.2%32.9%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 38.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
brownish with a pale-green tinge.
Pleochroism:
Weak
Comments:
brownish to greenish in oil

Chemistry of RhodarsenideHide

Mindat Formula:
(Rh,Pd)2As
Element Weights:
Element% weight
Rh73.312 %
As26.688 %

Calculated from ideal end-member formula.
Elements listed:
As, Pd, Rh - search for minerals with similar chemistry

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
Comment:
Point Group n.d.; Space Group n.d.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.237 Å(100)
2.067 Å(80)
2.426 Å(70)
1.935 Å(60)
1.860 Å(50)
1.828 Å(30)
1.384 Å(30)
1.306 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 RhodarsenideHide

Type Locality:
ⓘ Srebrnica River, Veluće, Trstenik, Rasina District, Central Serbia, Serbia
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:
ChromiteHollingworthiteIrarsite
Reference:
Tarkian M, Krstic S, Klaska K-H, Ließmann W (1997) Rhodarsenide, (Rh,Pd)2As, a new mineral. European Journal of Mineralogy 9, 1321-1325

Synonyms of RhodarsenideHide

Other Language Names for RhodarsenideHide

Common AssociatesHide

Associations Based on Photo Data:
5 photos of Rhodarsenide associated with 'Polyxene'(Pt,Fe,Cu,Ni,Pd,Rh)
2 photos of Rhodarsenide associated with Native Osmium(Os,Ir,Ru)
1 photo of Rhodarsenide associated with IsoferroplatinumPt3Fe
1 photo of Rhodarsenide associated with HongshiitePtCu

Related Minerals - Strunz-mindat GroupingHide

2.AC.VadlazarenkovitePd8Bi1.5Te1.25As0.25Trig. 3m(32/m) : R3c
2.AC.TörnroositePd11As2Te2Iso. m3m(4/m32/m) : Fd3m
2.AC.05bVincentitePd3AsMon.
2.AC.05aAtheneitePd2As0.75Hg0.25Hex. 6m2 : P62m
2.AC.10cArsenopalladinitePd8(As,Sb)3Tric. 1 : P1
2.AC.10bMertieitePd8Sb2.5As0.5Trig. 3m(32/m) : R3c
2.AC.10aStillwateritePd8As3Trig.
2.AC.15aIsomertieitePd11Sb2As2Iso. m3m(4/m32/m) : Fd3m
2.AC.15aMiessiitePd11Te2Se2Iso. m3m(4/m32/m) : Fd3m
2.AC.15bPseudomertieitePd11(Sb,As)4Hex.
2.AC.20cMenshikovitePd3Ni2As3Hex. 6/m : P63/m
2.AC.20aStibiopalladinitePd5Sb2Hex.
2.AC.20bPalarstanidePd5(Sn,As)2Hex.
2.AC.25cPalladodymite(Pd,Rh)2AsOrth. mmm(2/m2/m2/m) : Pnma
2.AC.25dNaldrettitePd2SbOrth. mm2 : Cmc21
2.AC.25eMajakitePdNiAsHex.
2.AC.25aPalladoarsenidePd2AsMon. 2/m : P2/m
2.AC.25fPalladobismutharsenidePd2(As,Bi)Orth.
2.AC.30'UM1999-02-As:NiRh'(Rh,Ni)7As4
2.AC.30PolkanoviteRh12As7Hex. 6/m : P63/m
2.AC.35bUngavaitePd4Sb3Tet. 422 : P41212
2.AC.35aGenkinitePt4Sb3Tet. 422
2.AC.40PolaritePd(Bi,Pb)Orth. mm2 : Cmc21
2.AC.45aFrooditeα-PdBi2Mon. 2/m : B2/m
2.AC.50ViteitePd5InAsTet. 4/mmm(4/m2/m2/m) : P4/mmm
2.AC.50NipalarsiteNi8Pd3As4Iso. m3m(4/m32/m)

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.

Internet Links for RhodarsenideHide

References for RhodarsenideHide

Localities for RhodarsenideHide

Showing 23 localities.

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.
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Locality ListHide

- 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). 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.
Canada
 
  • Ontario
    • Thunder Bay District
      • Coldwell complex
McDonald et al. (2015)
Gabon
 
  • Haut-Ogooué Province
    • Léboumbi-Leyou Department
Utsunomiya et al. (2006)
Japan
 
  • Hokkaidō Prefecture
    • Rumoi Subprefecture
      • Obira (Rumoi District)
NISHIO–HAMANE et al. (2022)
NISHIO–HAMANE et al. (2022)
      • Tomamae District
        • Haboro
NISHIO–HAMANE et al. (2022)
NISHIO–HAMANE et al. (2022)
        • Shosanbetsu
NISHIO–HAMANE et al. (2022)
        • Tomamae
NISHIO–HAMANE et al. (2022)
    • Sorachi Subprefecture
      • Numata
NISHIO–HAMANE et al. (2022)
Russia
 
  • Bashkortostan
    • Uchalinsky District
Pavel M. Kartashov analytical data 2018
  • Chelyabinsk Oblast
Excalibur Mineral Co. (Tony Nikischer)
  • Chukotka Autonomous Okrug
    • Bilibinsky District
      • Kolyma area
        • Bol'shoi Anyui River Basin
          • Baimka River
            • Aluchinskii Massif (Aluchin horst)
Gornostayev et al. (1999)
  • Kamchatka Krai
    • Koryak Okrug
      • Karaginsky District
Tolstykh et al. (2000)
    • Sobolevsky District
Sidorov et al. (2004)
Sidorov et al. (2004)
  • Kemerovo Oblast
Nesterenko +7 other references
Matthias Boehringer collection
  • Krasnoyarsk Krai
    • Lysanskiy dunite-peridotite-gabbro complex
Barkov et al. (2023)
  • Novosibirsk Oblast
    • Egor’evsk ore placer district
      • Ik placer field
Podlipsky et al. (2007)
  • Sakha
    • Anabar River basin
Airiyants et al. (2014) +1 other reference
Serbia (TL)
 
  • Central Serbia
    • Rasina District
      • Trstenik
        • Veluće
Tarkian M et al. (1997)
South Africa
 
  • Limpopo
    • Sekhukhune District Municipality
      • Fetakgomo Tubatse Local Municipality
Melcher et al. (2005)
        • Steelpoort
Oberthür et al. (2021)
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