Chengdeite Mineral Data

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

Diaphaniety:

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:

r_electron=15.7 gm/cc
note: r_Chengdeite=19.3 gm/cc.

Fermion Index

Fermion Index = 0.00187
Boson Index = 0.99813

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chengdeite is Not Radioactive

Chengdeite Classification

Dana Class:

1.2.5.5 (1)Native Elements

(1.2)with platinum group metals and alloys

(1.2.5)Isoferroplatinum group (Space Group Pm3m)

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

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

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

1.2.5.4 Zvyagintsevite (Pd,Pt,Au)3(Pb,Sn) P m3m 4/m 3 2/m

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

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

Strunz Class:

I/A.15-05 I - Elements

I/A - Metallic and intermetallic compounds, Platinum-Iron-compounds with Tin/Lead and related compunds

I/A.15 - Isoferroplatinum - Ferronickelplatinum series

I/A.15-05 Chengdeite Ir3Fe P m3m 4/m 3 2/m

I/A.15-10 Isoferroplatinum (Pt,Pd)3(Fe,Cu) P m3m 4/m 3 2/m

I/A.15-20 Tetraferroplatinum PtFe P 4/mmm 4/m 2/m 2/m

I/A.15-30 Tulameenite Pt2FeCu P 4/mm 4/m 2/m 2/m

I/A.15-40 Ferronickelplatinum Pt2FeNi P 4/mmm 4/m 2/m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Chengdeite

Ir3Fe
Dana No: 1.2.5.5 Strunz No: I/A.15-05
Locality:

Notes: