Mineralogy Database

Palladodymite Mineral Data

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General Palladodymite Information

Help on Chemical  Formula: Chemical Formula: (Pd,Rh)2As
Help on Composition: Composition: Molecular Weight = 284.77 gm
   Arsenic    26.31 %  As
   Palladium  42.98 %  Pd
   Rhodium    30.72 %  Rh
             100.00 % 
Help on Empirical Formula: Empirical Formula: Pd1.15Rh0.85As
Help on Environment: Environment: Platinum placers derived from ultra-basic rocks. Inclusions in native ruthenium.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Unnamed placer deposit in the upper Miass River, South Urals, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From (pallad)ium and the Greek for twin as it is the palladium-dominat analogue of rhodarsenide.
Help on Synonym: Synonym: IMA1997-028

Palladodymite Image

Click Here for Larger   Image in a New Browser Window 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

Palladodymite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5153:1:1.882
Help on Cell Dimensions: Cell Dimensions: a = 5.91, b = 3.9, c = 7.34, Z = 4; V = 169.18 Den(Calc)= 11.18
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.43(1), 2.24(0.5), 1.838(0.3),2.06(0.1),

Physical Properties of Palladodymite

Help on Cleavage: Cleavage: None
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Metallic

Optical Properties of Palladodymite

Help on RL Anisotrophism: RL Anisotrophism: Distinct, from bluish gray to reddish brown.
Help on RL Color: RL Color: Brownish gray with bluish tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Palladodymite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 480 nm   51.60   45.80 
 560 nm   54.80   46.90 
 580 nm   56.20   48.00 
 660 nm   59.10   50.20 
Calculated Relative Intensity Colors of Palladodymite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 200%

Calculated Properties of Palladodymite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=9.75 gm/cc
note: Specific Gravity of Palladodymite =11.2 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEPalladodymite = 191.48 barns/electron
U=PEPalladodymite x rElectron Density=1,866.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Palladodymite is Not Radioactive

Palladodymite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.04)where Am Bn Xp, with (m+n):p=2:1
  (02.04.19)Dana Group Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.AC.25c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.A - Simple Sulfides, Selenides, etc
  02.AC -Alloys of metalloids with PGE
02.AC.25c Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m

Other Palladodymite Information

Help on References: References: NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(AmMin, v 85, p 876)
Help on See Also: 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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Dana No: Strunz No: 02.AC.25c





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