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Iridarsenite

Collectors Summary

Color mittelgrau mit bräunlichen Farbton
Lustre Metallglanz
Hardness (Mohs) 5.5
Crystal System monoklin, P21/c

Chemism

Chemical formula

IrAs2

Chemical composition

Arsen, Iridium

Unit weight: 342.060504 u; Number of atoms in the formula: 3

Info

Empirical formula:

IrAs2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Arsenic

As

43.81

2

66.67

74.9216020

149.8432040

Iridium

Ir

56.19

1

33.33

192.2173000

192.2173000

Analysis wt%

Ø Ir : 49.90, Ru : 3.40, Os : 0.70, Pt : 1.00, Rh : 0.40, As : 44.50, PLT : 55.30 (Ref: Canadian Mineralogist 74)

Strunz 9th edition incl. updates

2.AC.50

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)
50:Iridarsenit-Gruppe

Lapis Classification

II/D.20-090

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
D: Sulfide mit Metall : S,Se,Te < 1:1
20: Markasit-Gruppe

Classification by Hölzel

2.EB.770

2: SULFIDES
E: Me/S=1/2 (also < 1/2)
B: With Fe,Co,Ni,PGE Pyrite, Marcasite Family
7: Arsenopyrite-Group

Dana 8th edition

02.12.04.05

02: Sulfide Minerals
12: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:2
04: Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic))

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

mittelgrau mit bräunlichen Farbton

Change in color

bräunlicher Farbton in reflektiertem Licht

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Pleochroism

sehr schwach

Anisotropism

deutlich

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 47.20, 46.90, 47.05
(546) 45.40, 46.10, 45.75
(589) 44.90, 46.60, 45.75
(650) 41.40, 44.00, 42.70

Reflection chart Iridarsenite

Reflectivity Ø

45.31

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell parameters a (Å)

6.05

Cell parameters b (Å)

6.06

Cell parameters c (Å)

6.18

Cell parameters a/b or c/a

0.998

Cell parameters c/b

1.020

Cell parameters α

90°

Cell parameters β

113.28

Cell parameters γ

90°

Z

4

Volume (ų)

208.13

X-Ray Powder Diffraction

3.90(100),
3.07(40),
2.840(70),
2.610(50),
2.069(60),
1.943(40),
1.910(50),
1.875(40)

XRD chart Iridarsenite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

VHN (Hardness Vickers)

547 (100g)

Density (g/cm³)

10.9

10.916 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Harris, 1974

References

Canadian Mineralogist 12 (1974), 280

Other languages

German

Iridarsenit

Spanish

Iridarsenita

French

Iridarsenite

English

Iridarsenite

Russian

Иридарсенит

Simplified Chinese

砷铱矿

CNMNC (IMA)-Number

IMA 1973-021

CNMNC symbol

Symbol

Ird

Locations with GPS information

IDs

GUSID (Global unique identifier short form) dSEuIt_dZk6T_MUzUvLtdg
GUID (Global unique identifier) 222E2175-DDDF-4E66-93FC-C53352F2ED76
Database ID 1736