Palladodymite Mineral Data

Palladodymite Mineral Data

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General Palladodymite Information

Chemical Formula:

(Pd,Rh)2As

Composition:

Molecular Weight = 284.77 gm

Arsenic 26.31 % As

Palladium 42.98 % Pd

Rhodium 30.72 % Rh

______

100.00 %

Empirical Formula:

Pd_1.15Rh_0.85As

Environment:

Platinum placers derived from ultra-basic rocks. Inclusions in native ruthenium.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Unnamed placer deposit in the upper Miass River, South Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

From (pallad)ium and the Greek for twin as it is the palladium-dominat analogue of rhodarsenide.

Synonym:

IMA1997-028

Palladodymite Image

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

Axial Ratios:

a:b:c =1.5153:1:1.882

Cell Dimensions:

a = 5.91, b = 3.9, c = 7.34, Z = 4; V = 169.18 Den(Calc)= 11.18

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/I_o): 2.43(1), 2.24(0.5), 1.838(0.3),2.06(0.1),

Physical Properties of Palladodymite

Cleavage:

None

Diaphaniety:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Palladodymite

RL Anisotrophism:

Distinct, from bluish gray to reddish brown.

RL Color:

Brownish gray with bluish tint.

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

Electron Density:

r_electron=9.75 gm/cc
note: r_{Palladodymite}=11.2 gm/cc.

Fermion Index

Fermion Index = 0.09596
Boson Index = 0.90404

Photoelectric:

PE_{Palladodymite}= 191.48 barns/electron
U=PE_{Palladodymite} x r_electron=1,866.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Palladodymite is Not Radioactive

Palladodymite Classification

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

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

References:

NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(AmMin, v 85, p 876)

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: