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Polkanovite

Collectors Summary

Color weiß mit cremfarben-roten Farbton
Hardness (Mohs) 5
Cleavages nicht beobachtet
Fracture nicht beobachtet
Crystal System hexagonal, P63/m

Chemism

Chemical formula

(Rh,Ni)12As7

Chemical composition

Arsen, Nickel, Rhodium

Unit weight: 1626.680992 u; Number of atoms in the formula: 19

Info

Empirical formula:

(Rh0.75Ni0.25)12As7

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Nickel

Ni

10.82

3

15.79

58.6934200

176.0802600

Arsenic

As

32.24

7

36.84

74.9216020

524.4512140

Rhodium

Rh

56.93

9

47.37

102.9055020

926.1495180

Analysis wt%

Ø Ru : 2.90, Rh : 54.30, Pd : 2.00, Os : 0.70, Ir : 0.70, Pt : 0.40, Ni : 7.00, As : 31.70 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 98)

Strunz 9th edition incl. updates

2.AC.30

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
A: Legierungen und legierungsartige Verbindungen
C: Verbindungen von Halbmetallen mit Platin-Gruppen-Elementen (PGE)
30:Polkanovit-Gruppe

Lapis Classification

II/A.05-115

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
A: Legierungen und legierungsartige Verbindungen
5: mit Metallen der Platin-gruppe (v.a. Pd)

Classification by Hölzel

2.AB.130

2: SULFIDES
A: Alloys of Cu,Ag,Au,Ni,Pd with As,Sb,Bi,(Te)
B: With Ni
1: Orcelite, Maucherite-Group

Dana 8th edition

02.04.20.01

02: Sulfide Minerals
04: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=2:1

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß mit cremfarben-roten Farbton

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

hexagonal

Class (H-M)

6/m

Space Group number

176

Space Group

P63/m

Cell parameters a (Å)

9.31

Cell parameters b (Å)

-

Cell parameters c (Å)

3.64

Cell parameters a/b or c/a

0.391

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

273.232

X-Ray Powder Diffraction

2.33(40),
2.03(20),
1.852(90),
1.767(60),
1.755(100),
1.549(80),
1.446(20),
1.166(20)

XRD chart Polkanovite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

410 (40g)

Density (g/cm³)

10.22

9.885 ( ρ calc. Mineralienatlas )

Cleavages

nicht beobachtet

Fracture

nicht beobachtet

Preface

Author (Name, Year)

Britvin & Rudashevsky & Bogdanova & Shcherbachov, 1998

References

Zapiski Vserossiskogo Mineralogicheskogo Obshchetstva 127 (1998) (2), 60

Other languages

German

Polkanovit

Spanish

Polkanovita

French

Polkanovite

English

Polkanovite

Russian

Полкановит

CNMNC (IMA)-Number

IMA 1997-030

CNMNC symbol

Symbol

Pkv

Locations with GPS information

IDs

GUSID (Global unique identifier short form) acMmW1BThUSrnFWgdr3kHg
GUID (Global unique identifier) 5B26C369-5350-4485-AB9C-55A076BDE41E
Database ID 3099