Palladoarsenide Mineral Data

Palladoarsenide Mineral Data +

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General Palladoarsenide Information

Chemical Formula:

Pd2As

Composition:

Molecular Weight = 287.76 gm

Arsenic 26.04 % As

Palladium 73.96 % Pd

______

100.00 %

Empirical Formula:

Pd₂As

Environment:

Minute grains in chalcopyrite that occurs in viens along the footwall of a Cu-Ni deposit.

IMA Status:

Approved IMA 1974

Locality:

Oktyabr mine, Talnakh area, Noril'sk district, western Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Synonym:

ICSD 26279

PDF 17-227

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Palladoarsenide Crystallography

Axial Ratios:

a:b:c =1.092:1:1.2325

Cell Dimensions:

a = 9.25, b = 8.47, c = 10.44, Z = 18; beta = 94° V = 815.96 Den(Calc)= 10.54

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/m

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

By Intensity(I/I_o): 2.14(1), 2.21(0.9), 2.6(0.7),

Physical Properties of Palladoarsenide

Cleavage:

[???] Good, [???] Good

Color:

Steel gray.

Density:

10.42

Diaphaniety:

Opaque

Fracture:

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

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Irregular Grains - Occurs as splotchy, anhedral crystals forming inclusions in other minerals or rocks.

Hardness:

5 - Apatite

Luster:

Metallic

Optical Properties of Palladoarsenide

RL Anisotrophism:

Moderate, dark gray wiht bluish tint to red-brown in air, dark gray to brownish gray in oil.

RL Color:

Grayish white with a slight rose tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Palladoarsenide in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	44.20	45.10
420 nm	46.80	46.80
440 nm	48.40	48.80
460 nm	49.40	50.30
480 nm	50.20	51.60
500 nm	51.20	53.10
520 nm	51.90	54.10
540 nm	52.50	54.80
560 nm	53.30	55.40
580 nm	53.90	55.80
600 nm	54.60	56.30
620 nm	55.40	57.10
640 nm	56.00	57.60
660 nm	56.60	58.10
680 nm	57.10	58.60
700 nm	57.80	59.20

**Calculated Relative Intensity Colors of Palladoarsenide in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Palladoarsenide

Electron Density:

r_electron=9.16 gm/cc
note: r_{Palladoarsenide}=10.5 gm/cc.

Fermion Index

Fermion Index = 0.16516
Boson Index = 0.83484

Photoelectric:

PE_{Palladoarsenide}= 197.46 barns/electron
U=PE_{Palladoarsenide} x r_electron=1,808.14 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Palladoarsenide is Not Radioactive

Palladoarsenide Classification

Dana Class:

2.4.14.1 (2)Sulfides - Including Selenides and Tellurides

(2.4)where Am Bn Xp, with (m+n):p=2:1

(2.4.14)Dana Group

2.4.14.1 Palladoarsenide Pd2As P 2/m 2/m

Strunz Class:

II/A.05-90 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 Palladoarsenide Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Palladoarsenide :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Palladoarsenide Specimen Label here :

Palladoarsenide

Pd2As
Dana No: 2.4.14.1 Strunz No: II/A.05-90
Locality:

Notes: