Roaldite

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Roaldite
General
Category Mineral
Formula
(repeating unit)
(Fe,Ni)4N
Strunz classification 01.BC.05
Dana classification 1.1.18.2
Crystal symmetry Isometric hextetrahedral H–M Symbol (4 3m)
Unit cell a = 3.79 Å; Z = 1
Identification
Colour Tin-white
Crystal habit Platelets in kamacite
Crystal system Cubic
Mohs scale hardness 5.5-6.5
Luster Metallic
Diaphaneity Opaque
Specific gravity 7.21
Optical properties Isotropic
References [1][2]

Roaldite is a rare meteorite mineral containing iron, nickel and nitrogen ((Fe,Ni)4N).

It was first described in 1981 for an occurrence in the Youngedin meteorite, Avon, Western Australia. It was named after Roald Norbach Nielsen (born 1928), a Danish expert in electron microprobe. The mineral has also been reported from the Jerslev meteorite, Sjaelland, Denmark, and the Canyon Diablo meteorite of Meteor Crater in Arizona.[1]

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