Vote for your favorite mineral in #MinCup26! - Azurite vs. Smithsonite
It's carbonate-vs-carbonate to kick off Mineral Cup 2026 with copper-rich Azurite against zinc-rich Smithsonite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Arsenopalladinite

A valid IMA mineral species - grandfathered
This page is currently not sponsored. Click here to sponsor this page.
03894630017271921013643.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
00119130017271921048857.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
08305890017271921063541.jpg
Arsenopalladinite

Itabira, Minas Gerais, Brazil
03894630017271921013643.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
00119130017271921048857.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
08305890017271921063541.jpg
Arsenopalladinite

Itabira, Minas Gerais, Brazil
03894630017271921013643.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
00119130017271921048857.jpg
Arsenopalladinite, etc.

Itabira, Minas Gerais, Brazil
Hide all sections | Show all sections

About ArsenopalladiniteHide

Formula:
Pd8(As,Sb)3
Colour:
Yellowish, creamy white in reflected light.
Lustre:
Metallic
Hardness:
4
Specific Gravity:
10.40
Crystal System:
Triclinic
Name:
For its chemical composition
Likely polymorphous with stillwaterite. One of several Pd arsenide minerals, comparable to, e.g., isomertieite, Unnamed (Pd Arsenide).

Also compare with UM1993-02-AsTe:Pd.


Unique IdentifiersHide

Mindat ID:
303
Long-form identifier:
mindat:1:1:303:0

Classification of ArsenopalladiniteHide

IMA Classification of ArsenopalladiniteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Pd8As3
Strunz-mindat (2026):
2.AC.10c

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
Dana 8th ed.:
2.16.5.1

2 : SULFIDES
16 : Miscellaneous
Hey's CIM Ref.:
3.12.29

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

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference for Standard
ApdnIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
ApdThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of ArsenopalladiniteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Yellowish, creamy white in reflected light.
Hardness:
4 on Mohs scale
Hardness:
VHN100=379 - 449 kg/mm2 - Vickers
Tenacity:
Malleable
Density:
10.40 g/cm3 (Measured)    11.028 g/cm3 (Calculated)

Optical Data of ArsenopalladiniteHide

Anisotropism:
Strong - red and golden brown to blue-gray - air; khaki-brown to blue gray and bright steel-gray in oil
Reflectivity:
WavelengthR1 (%)R2 (%)
400nm43.9% 44.5%
420nm44.7% 45.8%
440nm45.7% 46.5%
460nm46.8% 47.8%
480nm48.1% 49.4%
500nm49.4% 50.8%
520nm50.8% 52.4%
540nm52.1% 53.9%
560nm53.2% 55.1%
580nm54.4% 56.4%
600nm55.4% 57.3%
620nm56.4% 58.1%
640nm57.0% 58.8%
660nm57.7% 59.2%
680nm58.2% 59.8%
700nm58.8% 60.0%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 60.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White, with yellowish creamy tint

Chemistry of ArsenopalladiniteHide

Mindat Formula:
Pd8(As,Sb)3
Element Weights:
Element% weight
Pd79.114 %
As20.887 %

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

Crystallography of ArsenopalladiniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 7.43 Å, b = 13.95 Å, c = 7.35 Å
α = 92.88°, β = 119.5°, γ = 87.85°
Ratio:
a:b:c = 0.533 : 1 : 0.527
Unit Cell V:
662.14 ų (Calculated from Unit Cell)
Z:
6
Morphology:
Rounded grains to 1.8 mm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.34 Å(60)
2.28 Å(20)
2.19 Å(20)
2.13 Å(100)
1.41 Å(40)
1.24 Å(30)
1.21 Å(30)
Comments:
Itabira, Brazil.

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
Geological Setting:
Gold deposits

Type Occurrence of ArsenopalladiniteHide

Type Locality:
ⓘ Itabira, Minas Gerais, Brazil
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1934,72, 1977,258; Royal Ontario Museum, Toronto, Canada, M34726; National Museum of Natural History, Washington, D.C., USA, 142504.
Associated Minerals at Type Locality:
AtheneiteHematiteIsomertieiteNative GoldPalladseite
QuartzStillwaterite

Other Language Names for ArsenopalladiniteHide

Relationship of Arsenopalladinite to other SpeciesHide

Member of:
Arsenopalladinite Group
Other Members of Arsenopalladinite Group:
StibiopalladinitePd5Sb2Hex.

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Arsenopalladinite associated with Native GoldAu
1 photo of Arsenopalladinite associated with BorniteCu5FeS4
1 photo of Arsenopalladinite associated with PalladinitePdO
1 photo of Arsenopalladinite associated with AtheneitePd2As0.75Hg0.25
1 photo of Arsenopalladinite associated with Native PlatinumPt
1 photo of Arsenopalladinite associated with IsomertieitePd11Sb2As2

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.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.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.
Industrial Uses:
Palladium ore

Internet Links for ArsenopalladiniteHide

References for ArsenopalladiniteHide

Localities for ArsenopalladiniteHide

Showing 50 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.
Hide all sections | Show all sections

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.
Brazil (TL)
 
  • Minas Gerais
Chem. Index of Minerals (1955) +3 other references
Olivo et al. (1996) +1 other reference
  • Pará
    • Curionópolis
Berni et al. (2014)
Canada
 
  • Ontario
    • Kenora District
      • Ring of Fire
        • BMA527861 Area
N Farhangi
    • Thunder Bay District
      • Coldwell complex
McDonald et al. (2015) +1 other reference
Good et al. (2017)
      • Seeley Lake Area
Good et al. (2017)
EcoMetrix Reort for Stillwater Canada Inc (2012)
Good et al. (2017) +1 other reference
China
 
  • Yunnan
    • Dali
      • Midu County
Huanbin Song et al. (2008)
Ecuador
 
  • Carchi Province
    • Awa Indian Preserve
Barron et al. (2024)
Finland
 
Törnroos et al. (1998)
    • Enontekiö
33rd International Geological Congress (2008) +1 other reference
    • Inari
      • Ivalojoki
Kari Kojonen (2012)
    • Portimo complex
Papunen (1986)
Mineralogical Society of America - ...
    • Rovaniemi
Guice et al. (2017)
France
 
  • Auvergne-Rhône-Alpes
    • Ain
      • Bourg-en-Bresse
        • Lescheroux
Lorand et al. (2018) +1 other reference
India
 
  • Karnataka
    • Davanagere District
      • Shimoga schist belt
Devaraju et al. (2005)
Japan
 
  • Hokkaidō Prefecture
    • Kamikawa Subprefecture
The Mineral Species of Japan (5th ed)
Norway
 
  • Troms og Finnmark
    • Porsanger
Nilsson et al. (1998)
Portugal
 
  • Portalegre
    • Alter do Chão
Dias et al. (2006)
Russia
 
  • Khabarovsk Krai
    • Ayano-Maysky district
Lennikov et al. (2004)
Kasatkin et al. (2025)
  • Krasnoyarsk Krai
    • Taymyrskiy Autonomous Okrug
      • Taimyr Peninsula
Gritsenko et al. (2022)
Gritsenko et al. (2022)
  • Murmansk Oblast
    • Fedorovo-Pansky massif (Pana layered complex)
Sushchenko et al. (2023)
Groshev +7 other references
    • Kovdorsky District
Sorokhtina et al. (2021)
    • Monchegorsk
33 IGC excursion No 48
Chashchin et al. (2013)
Chashchin et al. (2013)
  • Republic of Karelia
    • Kondopozhsky District
- (2014)
  • Sverdlovsk Oblast
    • Karpinsk Urban Okrug
Mikhailov et al. (2021)
Mikhailov et al. (2021)
  • Tuva
    • Todzhinsky District
Kuzhuget et al. (2023) +1 other reference
  • Yamalo-Nenets Autonomous Okrug
    • Kershor Complex
Vikentyev et al. (2023)
    • Labytnangi
Murzin et al. (2022)
    • Priuralsky District
      • Kharp
Vikentyev et al. (2023)
Vikentyev et al. (2023)
South Africa
 
Cairncross et al. (1995)
  • Gauteng
    • City of Ekurhuleni Metropolitan Municipality
Maier et al. (2023)
  • Limpopo
    • Mopani District Municipality
      • Ba-Phalaborwa Local Municipality
        • Phalaborwa
Nikolay Rudashevsky et al (2001)
  • North West
    • Bojanala Platinum District Municipality
Mineralogical Society of America - ...
USA
 
  • Montana
Cabri et al. (1977) +1 other reference
    • Stillwater County
      • J-M Reef (Howland Reef)
 ...
Gobla (2012)
  • Pennsylvania
    • Chester County
Smith et al. (2011)
Zimbabwe
 
  • Masvingo
    • Chiredzi District
      • Chiredzi mining district
Oberthür et al. (2013)
Quick NavTopAbout ArsenopalladiniteUnique IdentifiersClassification IMA Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 1, 2026 06:01:37 Page updated: August 18, 2026 22:04:52
Go to top of page