Polkanovite Mineral Data

Polkanovite Mineral Data +

General Polkanovite Information

Chemical Formula:

Rh12As7

Composition:

Molecular Weight = 1,759.32 gm

Arsenic 29.81 % As

Rhodium 70.19 % Rh

______

100.00 %

Empirical Formula:

Rh₁₂As₇

Environment:

Residual mineral in a placer deposit. Intergrown with isoferropatinum and tulameenite within native ruthenium.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

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

Name Origin:

Named after Yuri Aleksandrovich Polkanov (b. 1935), Academician, Institute of Mineral Resources, Academy of Technical Sciences of Ukraine, known for his studies of the mineralogy an d ore deposits of the Crimean Peninsul

Synonym:

ICSD 61404

IMA1997-030

PDF 50-1691

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Polkanovite Crystallography

Axial Ratios:

a:c = 1:0.39097

Cell Dimensions:

a = 9.31, c = 3.64, Z = 1; V = 273.23 Den(Calc)= 10.69

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃m

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

By Intensity(I/I_o): 1.755(1), 1.852(0.9), 1.549(0.8),

Physical Properties of Polkanovite

Color:

Gray.

Density:

10.22

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Polkanovite

RL Anisotrophism:

Distinct.

RL Color:

White with cream-red tint.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Polkanovite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	43.50	44.50
535 nm	43.00	44.00
591 nm	44.00	45.00
658 nm	45.50	46.50

**Calculated Relative Intensity Colors of Polkanovite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%
R₁
R₂

Calculated Properties of Polkanovite

Electron Density:

r_electron=9.37 gm/cc
note: r_Polkanovite=10.7 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Polkanovite= 178.55 barns/electron
U=PE_Polkanovite x r_electron=1,672.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Polkanovite is Not Radioactive

Polkanovite Classification

Dana Class:

2.4.20.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.4.20)Dana Group

2.4.20.1 Polkanovite ! Rh12As7 P 6₃m 6/m

Strunz Class:

II/A.05-115 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 Polkanovite Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Polkanovite :
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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Print or Cut-and-Paste your Polkanovite Specimen Label here :

Polkanovite

Rh12As7
Dana No: 2.4.20.1 Strunz No: II/A.05-115
Locality:

Notes: