Rhodarsenide Mineral Data

Rhodarsenide Mineral Data +

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General Rhodarsenide Information

Chemical Formula:

(Rh,Pd)2As

Composition:

Molecular Weight = 282.49 gm

Arsenic 26.52 % As

Palladium 18.84 % Pd

Rhodium 54.64 % Rh

______

100.00 %

Empirical Formula:

Rh_1.5Pd_0.5As

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.

Synonym:

IMA1996-030

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Rhodarsenide Crystallography

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:

OrthorhombicSpace Group: P nma or Pn2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.237(1), 2.067(0.8), 2.426(0.7),

Physical Properties of Rhodarsenide

Color:

Brown.

Density:

11.27 - 11.32, Average = 11.29

Diaphaniety:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Metallic

Optical Properties of Rhodarsenide

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	∑ 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**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R₁
R₂

Calculated Properties of Rhodarsenide

Electron Density:

r_electron=9.84 gm/cc
note: r_Rhodarsenide=11.3 gm/cc.

Fermion Index

Fermion Index = 0.04206
Boson Index = 0.95794

Photoelectric:

PE_Rhodarsenide= 186.86 barns/electron
U=PE_Rhodarsenide x r_electron=1,838.05 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rhodarsenide is Not Radioactive

Rhodarsenide Classification

Dana Class:

2.4.19.1 (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

Strunz Class:

II/A.05-105 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 Rhodarsenide Information

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

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Rhodarsenide

(Rh,Pd)2As
Dana No: 2.4.19.1 Strunz No: II/A.05-105
Locality:

Notes: