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 Palladodymite Image in a New Browser Window Images:
Click Here for Larger Palladodymite Image

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 - DipyramidalH-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 Diaphaniety: Diaphaniety: 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
Relative
Intensity
   0%   30%   60%   90% 100% 120% 150% 180% 200%
R1                  
R2                  
 

Calculated Properties of Palladodymite

Help on Electron Density: Electron Density:

relectron=9.75 gm/cc
note: rPalladodymite =11.2 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.09596
Boson Index = 0.90404
Help on Photoelectric: Photoelectric:

PEPalladodymite = 191.48 barns/electron
U=PEPalladodymite x relectron=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: 2.4.19.2 (2)Sulfides - Including Selenides and Tellurides
  (2.4)where Am Bn Xp, with (m+n):p=2:1
  (2.4.19)Dana Group
 
2.4.19.1 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho
 
2.4.19.2 Palladodymite ! (Pd,Rh)2As P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: II/A.05-102 II - Sulfides and sulphosalts
  II/A - Alloys and alloylike compounds, with metals of the Platinum series, (Palladium)
  II/A.05 - Atheneite - Genkinite series
 
II/A.05-10 Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m
 
II/A.05-20 Vincentite (Pd,Pt)3(As,Sb,Te) Unk Mono
 
II/A.05-30 Stillwaterite Pd8As3 P 3 3
 
II/A.05-40 Arsenopalladinite Pd8(As,Sb)3 P1 1
 
II/A.05-50 Isomertieite Pd11Sb2As2 F d3m 4/m 3 2/m
 
II/A.05-60 Mertieite-I Pd11(Sb,As)4 Unk Hex
 
II/A.05-70 Mertieite-II Pd8(Sb,As)3 R 3c 3m
 
II/A.05-80 Stibiopalladinite Pd5Sb2 P 63mc 6mm
 
II/A.05-90 Palladoarsenide Pd2As P 2/m 2/m
 
II/A.05-100 Palladobismutharsenide Pd2(As,Bi) Pmcn,P 21cn Ortho
 
II/A.05-102 Palladodymite (Pd,Rh)2As P nma 2/m 2/m 2/m
 
II/A.05-105 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho
 
II/A.05-110 Majakite PdNiAs Unk Hex
 
II/A.05-112 Menshikovite! Pd3Ni2As3 P 63/m,P 63, or P 6322 Hex
 
II/A.05-115 Polkanovite! Rh12As7 P 63m 6/m
 
II/A.05-120 Genkinite (Pt,Pd)4Sb3 P 41212 4 2 2
 

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Palladodymite

(Pd,Rh)2As
Dana No: 2.4.19.2 Strunz No: II/A.05-102
Locality:

 

Notes:

 

 
   
 
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