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Changchengite (Changchengit)

Additional Functions

Collectors Summary

Color leuchtend weiß mit einem gelblichen Farbton
Streak color schwarz
Hardness (Mohs) 3.5
Cleavages keine
Fracture keiner
Solubility - HCl, HNO3, H3PO4
Crystal System kubisch, P213

Chemism

Chemical formula

IrBiS

Chemical composition

Bismut, Iridium, Schwefel

Unit weight: 433.263182 u; Number of atoms in the formula: 3

Info

Empirical formula:

IrBiS

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

7.40

1

33.33

32.0655000

32.0655000
Iridium

Ir

44.37

1

33.33

192.2173000

192.2173000
Bismuth

Bi

48.23

1

33.33

208.9803820

208.9803820

Analysis wt%

Ir : 41.20, Pt : 2.80, Bi : 47.20, Te : 0.40, S : 7.20, PLT : 44.00 (Ref: ActaGeol.Sin.97)

Strunz 9th edition incl. updates

2.EB.25

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
E: Metallsulfide mit M:S >= 1:2
B: M:S = 1:2, mit Fe, Co, Ni, PGE, usw.
25:Gersdorffit-Gruppe

Lapis Classification

II/D.17-153

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

Classification by Hölzel

2.EB.574

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

Dana 8th edition

02.12.03.14

02: Sulfide Minerals
12: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=1:2
03: Cobaltite Group (Cubic or pseudocubic crystals)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Cobaltite group

Optical Properties

Color

leuchtend weiß mit einem gelblichen Farbton

Streak color

schwarz

Diaphaneity (Transparency)

opak

Crystallography

Crystal System

kubisch

Class (H-M)

23

Space Group number

198

Space Group

P213

Cell parameters a (Å)

6.164

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

234.201

X-Ray Powder Diffraction

2.75(70),
2.51(60),
1.860(100),
1.647(40),
1.345(40),
1.185(40),
1.090(50),
1.027(50)
XRD chart Changchengite

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

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

165 (20g)

Density (g/cm³)

11.96 - 12.27 / Durchschnittlich = 12.1

12.287 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

keiner

Tenacity

spröde

Instability

- HCl, HNO3, H3PO4

(Co-)Type locality

(Co-)Type locality

China/Hebei, Provinz/Chengde, bezirksfreie Stadt/Luan-Fluss (Luan He)/Unbenannte Seifen-Lagerstätte

Preface

Author (Name, Year)

Yu Zuxiang, 1997

References

Acta Geologica Sinica (in Chinese) 71 (1997), 486

IMA group assignments

Other languages

German

Changchengit

Spanish

Changchengita

French

Changchengite

English

Changchengite

Russian

Чанченит

CNMNC (IMA)-Number

IMA 1995-047

CNMNC symbol

Symbol

Ccg