Roaldite Mineral Data

Roaldite Mineral Data +

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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.

Synonym:

ICSD 79980

PDF 6-627

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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

Diaphaniety:

Opaque

Hardness:

5.5-6.5 - Knife Blade-Pyrite

Luster:

Metallic

Calculated Properties of Roaldite

Electron Density:

r_electron=6.78 gm/cc
note: r_Roaldite=7.24 gm/cc.

Fermion Index

Fermion Index = 0.0781
Boson Index = 0.9219

Photoelectric:

PE_Roaldite= 29.58 barns/electron
U=PE_Roaldite x r_electron= 200.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roaldite is Not Radioactive

Roaldite Classification

Dana Class:

1.1.18.2 (1)Native Elements

(1.1)with metallic elements other than the platinum group

(1.1.18)Dana Group

1.1.18.1 Siderazot Fe5N2 P 6₃22 6 2 2

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

Strunz Class:

I/A.10-30 I - Elements

I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides

I/A.10 - Osbornite-Sinoite series

I/A.10-10 Osbornite TiN F m3m 4/m 3 2/m

I/A.10-20 Carlsbergite CrN F m3m 4/m 3 2/m

I/A.10-30 Roaldite (Fe,Ni)4N P 43m 4 3m

I/A.10-40 Siderazot Fe5N2 P 6₃22 6 2 2

I/A.10-45 Nierite Si3N4 P 3₁c 3m

I/A.10-50 Sinoite Si2N2O C mc2₁ mm2

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 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Roaldite

(Fe,Ni)4N
Dana No: 1.1.18.2 Strunz No: I/A.10-30
Locality:

Notes: