Mineralogy Database

Rhodarsenide Mineral Data

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General Rhodarsenide Information

Help on Chemical  Formula: Chemical Formula: (Rh,Pd)2As
Help on Composition: Composition: Molecular Weight = 282.49 gm
   Arsenic    26.52 %  As
   Palladium  18.84 %  Pd
   Rhodium    54.64 %  Rh
             100.00 % 
Help on Empirical Formula: Empirical Formula: Rh1.5Pd0.5As
Help on Environment: Environment: Placer deposits with other platinum group minerals.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Placer deposits near the Srebrnica River, near Veluce, central Serbia, Yugoslavia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its chemical composition of rhodium and arsenic.
Help on Name Pronunciation: Name Pronunciation: Rhodarsenide + Pronunciation Say RHODARSENIDE
Help on Synonym: Synonym: IMA1996-030

Rhodarsenide Image

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Comments: BSE image of dark gray metallic inclusion of rhodarsenide in sperrylite and Os,Ir,Ru matrix. Inset images show detail BSE and epoxy grain mount.
Location: Miass River, Urals, Russia. Scale: See Image.
© Rruff Database

Rhodarsenide Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5068:1:1.8756
Help on Cell Dimensions: Cell Dimensions: a = 5.866, b = 3.893, c = 7.302, Z = 4; V = 166.75 Den(Calc)= 11.25
Help on Crystal System: Crystal System: Orthorhombic Space Group: P nma or Pn2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.237(1), 2.067(0.8), 2.426(0.7),

Physical Properties of Rhodarsenide

Help on Color: Color: Brown.
Help on Density: Density: 11.27 - 11.32, Average = 11.29
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Metallic

Optical Properties of Rhodarsenide

Help on RL Anisotrophism: RL Anisotrophism: Moderate to distinct.
Help on RL Color: RL Color: Brownish with a pale green tinge.
Help on RL Pleochroism: RL Pleochroism: Weak in air, distinct in oil.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Rhodarsenide in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   46.30   45.50 
 546 nm   48.40   47.60 
 589 nm   49.50   48.20 
 650 nm   51.20   49.80 
Calculated Relative Intensity Colors of Rhodarsenide in Air
   0%   30%   60%   90% 100% 120% 150% 180% 200%

Calculated Properties of Rhodarsenide

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=9.84 gm/cc
note: Specific Gravity of Rhodarsenide =11.3 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PERhodarsenide = 186.86 barns/electron
U=PERhodarsenide x rElectron Density=1,838.05 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rhodarsenide is Not Radioactive

Rhodarsenide 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.25b 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.25b Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho

Other Rhodarsenide Information

Help on References: References: NAME( AmMin) PHYS. PROP.(Min.Mag.,Vol.61,p733,1997) OPTIC PROP.(MinRec, v 29, p 476)
Help on See Also: See Also: Links to other databases for Rhodarsenide :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 02.AC.25b





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