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Rhodarsenide Mineral Data
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General Rhodarsenide Information
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 Chemical Formula: |
(Rh,Pd)2As |
| Composition: |
Molecular Weight = 282.49 gm |
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Arsenic 26.52 % As |
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Palladium 18.84 % Pd |
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Rhodium 54.64 % Rh |
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______ |
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100.00 % |
| Empirical Formula: |
Rh1.5Pd0.5As |
| Environment: |
Placer deposits with other platinum group minerals. |
| IMA Status: |
Approved IMA 1997 (Dana # Added) |
| Locality: |
Placer deposits near the Srebrnica River, near Veluce, central Serbia, Yugoslavia. Link to MinDat.org Location Data. |
| Name Origin: |
Named after its chemical composition of rhodium and arsenic. |
| Name Pronunciation: |
Rhodarsenide + Pronunciation  |
| Synonym: |
IMA1996-030 |
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Rhodarsenide Image |
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Images:
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Rhodarsenide
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 |
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Rhodarsenide Crystallography
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| Axial Ratios: |
a:b:c =1.5068:1:1.8756 |
| Cell Dimensions: |
a = 5.866, b = 3.893, c = 7.302, Z = 4; V = 166.75 Den(Calc)= 11.25 |
| Crystal System: |
Orthorhombic Space Group: P nma or Pn2 |
| X Ray Diffraction: |
By Intensity(I/Io): 2.237(1), 2.067(0.8), 2.426(0.7), |
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Physical Properties of Rhodarsenide
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| Color: |
Brown. |
| Density: |
11.27 - 11.32, Average = 11.29 |
| Diaphaneity: |
Opaque |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
4-5 - Fluorite-Apatite |
| Luster: |
Metallic |
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Optical Properties of Rhodarsenide
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| RL Anisotrophism: |
Moderate to distinct. |
| RL Color: |
Brownish with a pale green tinge. |
| RL Pleochroism: |
Weak in air, distinct in oil. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rhodarsenide in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
46.30 |
45.50 |
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| 546 nm |
48.40 |
47.60 |
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| 589 nm |
49.50 |
48.20 |
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| 650 nm |
51.20 |
49.80 |
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Calculated Relative Intensity Colors of Rhodarsenide 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 Rhodarsenide
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| Electron Density: |
Bulk Density (Electron Density)=9.84 gm/cc
note: Specific Gravity of Rhodarsenide =11.3 gm/cc.
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| Fermion Index: |
Fermion Index = 0.04
Boson Index = 0.96 |
| Photoelectric: |
PERhodarsenide = 186.86 barns/electron
U=PERhodarsenide x rElectron Density=1,838.05 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rhodarsenide is Not Radioactive |
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Rhodarsenide Classification
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| Dana Class: |
02.04.19.01 (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.25b 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.25b Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho |
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Other Rhodarsenide Information
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| References: |
NAME( AmMin) PHYS. PROP.(Min.Mag.,Vol.61,p733,1997) OPTIC PROP.(MinRec, v 29, p 476) |
| 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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Rhodarsenide
(Rh,Pd)2As
Dana No: 02.04.19.01 Strunz No: 02.AC.25b
Locality:
Notes:
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