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Palladodymite

A valid IMA mineral species
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03984700017659342456571.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
03048200017271928801877.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
03984700017659342456571.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
03048200017271928801877.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
03984700017659342456571.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
03048200017271928801877.jpg
Palladodymite, etc.

Miass River, Chelyabinsk Oblast, Russia
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About PalladodymiteHide

Formula:
(Pd,Rh)2As
Lustre:
Metallic
Specific Gravity:
11.3 (Calculated)
Crystal System:
Orthorhombic
Name:
From (pallad)ium and the Greek for twin as it is the palladium-dominant analogue of rhodarsenide.
This page provides mineralogical data about Palladodymite.


Unique IdentifiersHide

Mindat ID:
7214
Long-form identifier:
mindat:1:1:7214:0

IMA Classification of PalladodymiteHide

Classification of PalladodymiteHide

Strunz-mindat (2026):
2.AC.25c

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

Physical Properties of PalladodymiteHide

Lustre:
Metallic
Transparency:
Opaque
Hardness:
VHN20=546 - 611 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
11.3 g/cm3 (Calculated)

Optical Data of PalladodymiteHide

Anisotropism:
Distinctly anisotropic from bluish gray to reddish brown.
Reflectivity:
WavelengthR1 (%)R2 (%)
420nm50.5%45.5%
440nm50.6%45.4%
460nm50.7%45.5%
480nm51.6%45.8%
500nm52.6%46.5%
520nm53.3%46.9%
540nm54.0%46.8%
560nm54.8%46.9%
580nm56.2%48.0%
600nm57.6%48.5%
620nm57.8%48.9%
640nm58.2%49.5%
660nm59.1%50.2%
680nm59.7%50.6%
700nm60.6%50.8%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 60.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Brownish gray with a bluish tint.

Chemistry of PalladodymiteHide

Mindat Formula:
(Pd,Rh)2As
Element Weights:
Element% weight
Pd73.964 %
As26.036 %

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

Crystallography of PalladodymiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 5.91(2) Å, b = 3.90(1) Å, c = 7.34(2) Å
Ratio:
a:b:c = 1.515 : 1 : 1.882
Unit Cell V:
169.18 ų (Calculated from Unit Cell)
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.43 Å(100)
2.24 Å(50)
1.838 Å(30)
2.06 Å(10)
1.710 Å(10)
1.484 Å(10)
1.380 Å(10)

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 PalladodymiteHide

Type Locality:
ⓘ Miass River, Chelyabinsk Oblast, Russia
General Appearance of Type Material:
Inclusions, up to 30 × 70 µm, in native ruthenium.
Place of Conservation of Type Material:
Mining Museum, Saint Petersburg Mining Institute, Russia.
Geological Setting of Type Material:
Placer deposit
Associated Minerals at Type Locality:
Native RutheniumIsoferroplatinumCherepanoviteIrarsiteHongshiite
SperryliteTulameenite
Reference:
Brtivin, S. N., Rudashevsky, N. S., Bogdanova, A. N., Shcherbachov, D. K. (1999) Palladodymite (Pd,Rh)2As, a new mineral from a placier of the Miass River, the Urals. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 128 (2) 39-42

Synonyms of PalladodymiteHide

Other Language Names for PalladodymiteHide

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Palladodymite associated with HongshiitePtCu
1 photo of Palladodymite associated with Native Ruthenium(Ru,Ir)
1 photo of Palladodymite associated with VincentitePd3As
1 photo of Palladodymite associated with CherepanoviteRhAs
1 photo of Palladodymite associated with IsoferroplatinumPt3Fe

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.25dNaldrettitePd2SbOrth. mm2 : Cmc21
2.AC.25bRhodarsenide(Rh,Pd)2AsOrth.
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 PalladodymiteHide

References for PalladodymiteHide

Localities for PalladodymiteHide

Showing 14 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
Ames et al. (2017)
Ames et al. (2017)
Gabon
 
  • Haut-Ogooué Province
    • Léboumbi-Leyou Department
Utsunomiya et al. (2006)
Germany
 
  • Rhineland-Palatinate
    • Germersheim
      • Jockgrim
        • Rheinzabern
Oberthür et al. (2016)
Greece
 
  • Thessaly
    • Trikala
      • Meteora
Kapsiotis et al. (2011)
Japan
 
  • Hokkaidō Prefecture
    • Rumoi Subprefecture
NISHIO–HAMANE et al. (2022)
      • Tomamae District
        • Tomamae
NISHIO–HAMANE et al. (2022)
Russia (TL)
 
  • Chelyabinsk Oblast
Britvin et al. (1998) +2 other references
  • Jewish Autonomous Oblast
Nevstruev et al. (2019)
  • Tuva
    • Kaa-Khemsky District
      • Kaakhem ophiolite belt
E.V. et al. (2025)
South Africa
 
  • Limpopo
    • Capricorn District Municipality
      • Blouberg Local Municipality
McFall et al. (2019)
    • Sekhukhune District Municipality
      • Fetakgomo Tubatse Local Municipality
        • Steelpoort
Oberthür et al. (2021)
USA
 
  • Alaska
    • Kodiak Island Borough
      • Tugidak Island
Belkin et al. (2021)
Zimbabwe
 
  • Mashonaland West
    • Kadoma District
      • Mhondoro
Oberthür et al. (2013)
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