Rhodarsenide
A valid IMA mineral species
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About Rhodarsenide
Formula:
(Rh,Pd)2As
Lustre:
Metallic
Hardness:
4 - 5
Specific Gravity:
11.32 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after its chemical composition of rhodium and arsenic.
This page provides mineralogical data about Rhodarsenide.
Unique Identifiers
Mindat ID:
7270
Long-form identifier:
mindat:1:1:7270:6
GUID
(UUID V4):
(UUID V4):
b5aef33e-331e-4aa9-80a0-34e0dffd90d3
IMA Classification of Rhodarsenide
Approved
IMA Formula:
Rh2As
First published:
1997
Classification of Rhodarsenide
2.AC.25b
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
A : Alloys
C : Alloys of metalloids with PGE
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Rda | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Rhodarsenide
Metallic
Transparency:
Opaque
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN25=493 - 585 kg/mm2 - Vickers
Density:
11.32 g/cm3 (Calculated)
Optical Data of Rhodarsenide
Anisotropism:
moderate from dark brown to greenish grey
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
470(39.8,35.7) 546(40.4,36.4) 589(40.5,36.6) 650nm | 38.2% | 32.9% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 38.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
brownish with a pale-green tinge.
Pleochroism:
Weak
Comments:
brownish to greenish in oil
Chemistry of Rhodarsenide
Mindat Formula:
(Rh,Pd)2As
Elements listed:
Crystallography of Rhodarsenide
Crystal System:
Orthorhombic
Cell Parameters:
a = 5.866(5) Å, b = 3.893(2) Å, c = 7.302(4) Å
Ratio:
a:b:c = 1.507 : 1 : 1.876
Unit Cell V:
166.75 ų (Calculated from Unit Cell)
Z:
4
Comment:
Point Group n.d.; Space Group n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.237 Å | (100) |
2.067 Å | (80) |
2.426 Å | (70) |
1.935 Å | (60) |
1.860 Å | (50) |
1.828 Å | (30) |
1.384 Å | (30) |
1.306 Å | (30) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
26 : Hadean detrital minerals | |
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
37 : Layered igneous intrusions and related PGE minerals |
Type Occurrence of Rhodarsenide
General Appearance of Type Material:
irregular inclusions
Place of Conservation of Type Material:
Mineralogical Museum of the University of Hamburg,
Geological Setting of Type Material:
placer platinum deposits derived from chromites in ophiolite complex
Associated Minerals at Type Locality:
Reference:
Tarkian, M., Krstic, S., Klaska, K.-H., Ließmann, W. (1997) Rhodarsenide, (Rh,Pd)2As, a new mineral. European Journal of Mineralogy: 9: 1321-1325.
Synonyms of Rhodarsenide
Other Language Names for Rhodarsenide
German:Rhodarsenid
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Rhodarsenide associated with Polyxene | (Pt,Fe,Cu,Ni,Pd,Rh) |
1 photo of Rhodarsenide associated with Osmium | (Os,Ir,Ru) |
1 photo of Rhodarsenide associated with Isoferroplatinum | Pt3Fe |
1 photo of Rhodarsenide associated with Hongshiite | PtCu |
Related Minerals - Strunz-mindat Grouping
2.AC. | Törnroosite | Pd11As2Te2 |
2.AC. | Vadlazarenkovite | Pd8Bi1.5Te1.25As0.25 |
2.AC.05a | Atheneite | Pd2As0.75Hg0.25 |
2.AC.05b | Vincentite | Pd3As |
2.AC.10c | Arsenopalladinite | Pd8(As,Sb)3 |
2.AC.10b | Mertieite | Pd8Sb2.5As0.5 |
2.AC.10a | Stillwaterite | Pd8As3 |
2.AC.15a | Isomertieite | Pd11Sb2As2 |
2.AC.15b | Pseudomertieite | Pd11(Sb,As)4 |
2.AC.15a | Miessiite | Pd11Te2Se2 |
2.AC.20b | Palarstanide | Pd5(Sn,As)2 |
2.AC.20a | Stibiopalladinite | Pd5Sb2 |
2.AC.20c | Menshikovite | Pd3Ni2As3 |
2.AC.25e | Majakite | PdNiAs |
2.AC.25a | Palladoarsenide | Pd2As |
2.AC.25f | Palladobismutharsenide | Pd2(As,Bi) |
2.AC.25c | Palladodymite | (Pd,Rh)2As |
2.AC.25d | Naldrettite | Pd2Sb |
2.AC.30 | UM1999-02-As:NiRh | (Rh,Ni)7As4 |
2.AC.30 | Polkanovite | Rh12As7 |
2.AC.35a | Genkinite | Pt4Sb3 |
2.AC.35b | Ungavaite | Pd4Sb3 |
2.AC.40 | Polarite | Pd(Bi,Pb) |
2.AC.45a | Froodite | α-PdBi2 |
2.AC.50 | Nipalarsite | Ni8Pd3As4 |
2.AC.50 | Viteite | Pd5InAs |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Rhodarsenide
mindat.org URL:
https://www.mindat.org/min-7270.html
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References for Rhodarsenide
Reference List:
Localities for Rhodarsenide
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Canada | |
| Mcdonald et al. (2015) |
Gabon | |
| Utsunomiya et al. (2006) |
Japan | |
| NISHIO–HAMANE et al. (2022) |
NISHIO–HAMANE et al. (2022) | |
| NISHIO–HAMANE et al. (2022) |
NISHIO–HAMANE et al. (2022) | |
| NISHIO–HAMANE et al. (2022) |
| NISHIO–HAMANE et al. (2022) |
| NISHIO–HAMANE et al. (2022) |
Russia | |
| Pavel M. Kartashov analytical data 2018 |
| Gornostayev et al. (1999) |
| Tolstykh et al. (2000) |
| Sidorov et al. (2004) |
Sidorov et al. (2004) | |
| Nesterenko +7 other references |
| Podlipsky et al. (2007) |
| Airiyants et al. (2014) |
Serbia (TL) | |
| Tarkian M et al. (1997) |
South Africa | |
| Melcher et al. (2005) |
| Oberthür et al. (2021) |
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Miass River, Chelyabinsk Oblast, Russia