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

Unnamed (Pd Arsenide)

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Pd5As2
From empirical formula (Stillwater Complex): close to (Pd,Au,Hg,Cu,Pt)8(As,Sn)2
Colour:
brown-grey (phase II, Poland; reflected light?)
Crystal System:
Orthorhombic
The correct name is UM1975-05-As:Pd. Compositionally similar to arsenopalladinite, stillwaterite, isomertieite. Compare 'UM1984-01-As:AgAuCuNiPdS'.

The material from Polish Cu-bearing Zechstein shales, associated with electrum and sometimes found in the contact zone of gold and other Pd minerals, corresponds to:

- Pd2.73Cu0.67Ag0.55Au0.37(Ni,Co,Fe,Bi)0.67As2.00S0.19 phase [here: phase I]
- a similar Pd3.21Ag0.60Cu0.49Ni0.22(Au,Co,Bi,Fe)0.09As2.00S0.17 phase [here: phase II]

The material from Stillwater Complex is coded in the Valid Unnamed Minerals list as UM1975-05-As:Pd; it coexists with chalcopyrite, palladoarsenide, sperrylite; with stillwaterite; with and Unnamed (Pd-Cu-As phase).

Compare: UM1975-06-As:Pd, UM1975-01-As:AgCoNiPdS, UM1975-02-As:AgCuNiPdS, UM1975-03-As:AgCuPdS, UM1975-04-As:NiPdS, Unnamed (Pd Arsenide Sulfide).


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
7675
Long-form identifier:
mindat:1:1:7675:9

Physical Properties of Unnamed (Pd Arsenide)Hide

Colour:
Brown-grey (phase II, Poland; reflected light?)

Optical Data of Unnamed (Pd Arsenide)Hide

Bireflectance:
none to weak (oil, Stillwater Complex); weak (air, Poland)
Reflectivity:
WavelengthR1 (%)
0nm8 (Poland%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 8 (Poland%.
Colour in reflected light:
pale cream to cream (Stillwater Complex)

Chemistry of Unnamed (Pd Arsenide)Hide

Mindat Formula:
Pd5As2

From empirical formula (Stillwater Complex): close to (Pd,Au,Hg,Cu,Pt)8(As,Sn)2
Element Weights:
Element% weight
Pd78.027 %
As21.973 %

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

Crystallography of Unnamed (Pd Arsenide)Hide

Crystal System:
Orthorhombic
Cell Parameters:
a = 11.261(4) Å, b = 3.857(1) Å, c = 11.345(5) Å
Ratio:
a:b:c = 2.92 : 1 : 2.941
Unit Cell V:
492.76 ų (Calculated from Unit Cell)
Comment:
Stillwater Complex

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.066 Å(100)
2.778 Å(60)
2.433 Å(50)
2.119 Å(80)
1.947 Å(90)
0.7770 Å(90)
Comments:
Stillwater Complex; different from stillwaterite and arsenopalladinite

Synonyms of Unnamed (Pd Arsenide)Hide

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 Unnamed (Pd Arsenide)Hide

References for Unnamed (Pd Arsenide)Hide

Localities for Unnamed (Pd Arsenide)Hide

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 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.
Poland
 
  • Lower Silesian Voivodeship
    • Legnica City
Kucha (1975)
Russia
 
  • Krasnoyarsk Krai
    • Taymyrskiy Autonomous Okrug
      • Taimyr Peninsula
        • Norilsk-Talnakh Mining Region
[AmMin 85:265]
Sluzhenikin et al. (2015)
  • Murmansk Oblast
    • Monchegorsk
      • Sopcha Massif
[AmMin 65:198]
Quick NavTopUnique IdentifiersPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionSynonymsOther 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 07:15:24 Page updated: January 3, 2026 08:12:05
Go to top of page