Chengdeite Mineral Data

General Chengdeite Information

Chemical Formula:

Ir3Fe

Composition:

Molecular Weight = 632.51 gm

Iron 8.83 % Fe

Iridium 91.17 % Ir

______

100.00 %

Empirical Formula:

Ir₃Fe⁰⁺

Environment:

In placer concentrations and chromate ores in ultrabasic rocks.

IMA Status:

Approved IMA 1995

Locality:

At the branch of the Luan river (about 200 km NNE of Beijing) in Chengde County, Peoples Republic of China. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 56264

IMA1994-023

PDF 49-1824

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Chengdeite Crystallography

Cell Dimensions:

a = 3.792, Z = 1; V = 54.53 Den(Calc)= 19.26

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

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

By Intensity(I/I_o): 1.142(1), 1.094(0.8), 2.18(0.8),

Physical Properties of Chengdeite

Cleavage:

None

Color:

Steel black.

Density:

19.3

Diaphaneity:

Opaque

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Nuggets - Irregular lumps produced by stream transport of malleable metals.

Hardness:

5 - Apatite

Luster:

Metallic

Streak:

black

Calculated Properties of Chengdeite

Electron Density:

Bulk Density (Electron Density)=15.7 gm/cc
note: Specific Gravity of Chengdeite =19.3 gm/cc.

Fermion Index:

Fermion Index = 0.0018718471
Boson Index = 0.9981281529

Photoelectric:

PE_Chengdeite=1,393.05 barns/electron
U=PE_Chengdeite x rElectron Density=21803.16 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chengdeite is Not Radioactive

Chengdeite Classification

Dana Class:

01.02.05.05 (01)Native Elements

(01.02)with platinum group metals and alloys

(01.02.05)Isoferroplatinum group (Space Group Pm3m)

01.02.05.01 Isoferroplatinum (Pt,Pd)3(Fe,Cu) P m3m 4/m 3 2/m

01.02.05.02 Rustenburgite (Pt,Pd)3Sn F m3m 4/m 3 2/m

01.02.05.03 Atokite (Pd,Pt)3Sn F m3m 4/m 3 2/m

01.02.05.04 Zvyagintsevite Pd3Pb P m3m 4/m 3 2/m

01.02.05.05 Chengdeite Ir3Fe P m3m 4/m 3 2/m

01.02.05.06 Yixunite! Pt3In P m3m 4/m 3 2/m

Strunz Class:

01.AG.35 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.A - Metals and Intermetallic Alloys

01.AG -PGE-metal alloys

01.AG.35 Chengdeite Ir3Fe P m3m 4/m 3 2/m

01.AG.35 Isoferroplatinum (Pt,Pd)3(Fe,Cu) P m3m 4/m 3 2/m

Other Chengdeite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996)

See Also:

Links to other databases for Chengdeite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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

Chengdeite

Ir3Fe
Dana No: 01.02.05.05 Strunz No: 01.AG.35
Locality:

Notes: