Palladodymite
A valid IMA mineral species
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About Palladodymite
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.
Type Locality:
This page provides mineralogical data about Palladodymite.
Unique Identifiers
Mindat ID:
7214
Long-form identifier:
mindat:1:1:7214:0
GUID
(UUID V4):
(UUID V4):
05ee2e3f-9b9d-490a-90b4-f0c580ac4241
Classification of Palladodymite
Approved
First published:
1999
Type description reference:
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
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Pdd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Palladodymite
Metallic
Transparency:
Opaque
Hardness:
VHN20=546 - 611 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Density:
11.3 g/cm3 (Calculated)
Optical Data of Palladodymite
Anisotropism:
Distinctly anisotropic from bluish gray to reddish brown.
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
420nm | 50.5% | 45.5% |
440nm | 50.6% | 45.4% |
460nm | 50.7% | 45.5% |
480nm | 51.6% | 45.8% |
500nm | 52.6% | 46.5% |
520nm | 53.3% | 46.9% |
540nm | 54.0% | 46.8% |
560nm | 54.8% | 46.9% |
580nm | 56.2% | 48.0% |
600nm | 57.6% | 48.5% |
620nm | 57.8% | 48.9% |
640nm | 58.2% | 49.5% |
660nm | 59.1% | 50.2% |
680nm | 59.7% | 50.6% |
700nm | 60.6% | 50.8% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 60.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Brownish gray with a bluish tint.
Chemical Properties of Palladodymite
Formula:
(Pd,Rh)2As
IMA Formula:
Pd2As
Elements listed:
Crystallography of Palladodymite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
26 : Hadean detrital minerals | |
High-𝑇 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 Palladodymite
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:
Reference:
Britvin, 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 Palladodymite
Other Language Names for Palladodymite
German:Palladodymit
Spanish:Palladodymita
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Palladodymite associated with Hongshiite | PtCu |
1 photo of Palladodymite associated with Ruthenium | (Ru,Ir) |
Related Minerals - Strunz-mindat Grouping
2.AC. | Törnroosite | Pd11As2Te2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.05a | Atheneite | Pd2As0.75Hg0.25 | Hex. 6 m2 : P62m |
2.AC.05b | Vincentite | Pd3As | Mon. |
2.AC.10c | Arsenopalladinite | Pd8(As,Sb)3 | Tric. 1 : P1 |
2.AC.10b | Mertieite | Pd8Sb2.5As0.5 | Trig. 3m (3 2/m) : R3c |
2.AC.10a | Stillwaterite | Pd8As3 | Trig. |
2.AC.15a | Isomertieite | Pd11Sb2As2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 | Hex. |
2.AC.15a | Miessiite | Pd11Te2Se2 | Iso. m3m (4/m 3 2/m) : Fd3m |
2.AC.20b | Palarstanide | Pd5(Sn,As)2 | Hex. |
2.AC.20a | Stibiopalladinite | Pd5Sb2 | Hex. |
2.AC.20c | Menshikovite | Pd3Ni2As3 | Hex. 6/m : P63/m |
2.AC.25e | Majakite | PdNiAs | Hex. |
2.AC.25a | Palladoarsenide | Pd2As | Mon. 2/m : P2/m |
2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) | Orth. |
2.AC.25b | Rhodarsenide | (Rh,Pd)2As | Orth. |
2.AC.25d | Naldrettite | Pd2Sb | Orth. mm2 : Cmc21 |
2.AC.30 | UM1999-02-As:NiRh | (Rh,Ni)7As4 | |
2.AC.30 | Polkanovite | Rh12As7 | Hex. 6/m : P63/m |
2.AC.35a | Genkinite | Pt4Sb3 | Tet. 4 2 2 |
2.AC.35b | Ungavaite | Pd4Sb3 | Tet. 4 2 2 : P41 21 2 |
2.AC.40 | Polarite | Pd(Bi,Pb) | Orth. mm2 : Cmc21 |
2.AC.45a | Froodite | α-PdBi2 | Mon. 2/m : B2/m |
2.AC.50 | Nipalarsite | Ni8Pd3As4 | Iso. m3m (4/m 3 2/m) |
2.AC.50 | Viteite | Pd5InAs | Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm |
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.
Internet Links for Palladodymite
mindat.org URL:
https://www.mindat.org/min-7214.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Palladodymite
Reference List:
Localities for Palladodymite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Canada | |
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Gabon | |
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Germany | |
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Greece | |
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Japan | |
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Russia (TL) | |
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South Africa | |
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USA | |
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Zimbabwe | |
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Quick NavTopAbout PalladodymiteUnique IdentifiersClassification Mineral SymbolsPhysical Properties Optical Data Chemical Properties Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Miass River, Chelyabinsk Oblast, Russia