Roaldite Mineral Data

General Roaldite Information

Chemical Formula:

(Fe,Ni)4N

Composition:

Molecular Weight = 237.96 gm

Iron 89.18 % Fe

Nickel 4.93 % Ni

Nitrogen 5.89 % N

______

100.00 %

Empirical Formula:

Fe²⁺_3.8Ni_0.2N

Environment:

Platelets in kamacite phase of coarse octahedrites.

IMA Status:

Approved IMA 1981

Locality:

Jerslev meteorite, Sjaelland, Denmark and Youndegin meteorite, Avon, Western Australia, Australia. Link to MinDat.org Location Data.

Name Origin:

Named in 1981 for Roald Nielsen (b.1928), Danish metallurgist.

Name Pronunciation:

Roaldite

Synonym:

ICSD 79980

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Roaldite Crystallography

Cell Dimensions:

a = 3.79, Z = 1; V = 54.44 Den(Calc)= 7.26

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43m

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

By Intensity(I/I_o): 2.191(1), 1.144(0.85), 1.897(0.75),

Crystal Structure:

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Bayliss P , The Canadian Mineralogist , 28 (1990) p.751-755, Revised unit cell dimensions, space group,, and chemical formua of some metallic minerals, Locality: synthetic, Note: Fe and N positions switched to match formula, Note: cell edge taken from Handbook of Mineralogy

Physical Properties of Roaldite

Color:

Tin white.

Density:

7.21

Diaphaneity:

Opaque

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Metallic

Calculated Properties of Roaldite

Electron Density:

Bulk Density (Electron Density)=6.80 gm/cc
note: Specific Gravity of Roaldite =7.26 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Roaldite= 29.58 barns/electron
U=PE_Roaldite x rElectron Density= 201.06 barns/cc.

Radioactivity:

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

Roaldite Classification

Dana Class:

01.01.18.02 (01)Native Elements

(01.01)with metallic elements other than the platinum group

(01.01.18)Dana Group

01.01.18.01 Siderazot Fe5N2 P 6₃22 6 2 2

01.01.18.02 Roaldite (Fe,Ni)4N P 43m 4 3m

Strunz Class:

01.BC.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.B - Metallic Carbides, Silicides, Nitrides and Phosphides

01.BC -Nitrides

01.BC.05 Roaldite (Fe,Ni)4N P 43m 4 3m

Other Roaldite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Roaldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
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 Roaldite Specimen Label here :

Roaldite

(Fe,Ni)4N
Dana No: 01.01.18.02 Strunz No: 01.BC.05
Locality:

Notes: