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Palladodymite Mineral Data
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General Palladodymite Information
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 Chemical Formula: |
(Pd,Rh)2As |
| Composition: |
Molecular Weight = 284.77 gm |
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Arsenic 26.31 % As |
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Palladium 42.98 % Pd |
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Rhodium 30.72 % Rh |
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______ |
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100.00 % |
| Empirical Formula: |
Pd1.15Rh0.85As |
| Environment: |
Platinum placers derived from ultra-basic rocks. Inclusions in native ruthenium. |
| IMA Status: |
Approved IMA 1999 (Dana # Added) |
| Locality: |
Unnamed placer deposit in the upper Miass River, South Urals, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
From (pallad)ium and the Greek for twin as it is the palladium-dominat analogue of rhodarsenide. |
| Synonym: |
IMA1997-028 |
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Palladodymite Image |
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Images:
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Palladodymite Hongshiite Ruthenium
Comments: Palladodymite (light gray, in two small grains), hongshiite (pale creamy grayish, tarnished brownish) in massive ruthenium. Polished section (from microprobe analysis) in reflected light.
Location: Miass River, Zlatoust, Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia.
Scale: Picture size 0.09 mm.
© Thomas Witzke / Abraxas-Verlag |
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Palladodymite Crystallography
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| Axial Ratios: |
a:b:c =1.5153:1:1.882 |
| Cell Dimensions: |
a = 5.91, b = 3.9, c = 7.34, Z = 4; V = 169.18 Den(Calc)= 11.18 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 2.43(1), 2.24(0.5), 1.838(0.3),2.06(0.1), |
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Physical Properties of Palladodymite
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| Cleavage: |
None |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Luster: |
Metallic |
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Optical Properties of Palladodymite
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| RL Anisotrophism: |
Distinct, from bluish gray to reddish brown. |
| RL Color: |
Brownish gray with bluish tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Palladodymite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 480 nm |
51.60 |
45.80 |
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| 560 nm |
54.80 |
46.90 |
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| 580 nm |
56.20 |
48.00 |
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| 660 nm |
59.10 |
50.20 |
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Calculated Relative Intensity Colors of Palladodymite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
200% |
| R1 |
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| R2 |
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Calculated Properties of Palladodymite
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| Electron Density: |
Bulk Density (Electron Density)=9.75 gm/cc
note: Specific Gravity of Palladodymite =11.2 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PEPalladodymite = 191.48 barns/electron
U=PEPalladodymite x rElectron Density=1,866.60 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Palladodymite is Not Radioactive |
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Palladodymite Classification
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| Dana Class: |
02.04.19.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.04)where Am Bn Xp, with (m+n):p=2:1 |
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(02.04.19)Dana Group |
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02.04.19.01 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho |
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02.04.19.02 Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m |
| Strunz Class: |
02.AC.25c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.A - Simple Sulfides, Selenides, etc |
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02.AC -Alloys of metalloids with PGE |
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02.AC.25c Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m |
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Other Palladodymite Information
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| References: |
NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(AmMin, v 85, p 876) |
| See Also: |
Links to other databases for Palladodymite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Palladodymite
(Pd,Rh)2As
Dana No: 02.04.19.02 Strunz No: 02.AC.25c
Locality:
Notes:
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