Chemistry:Roaldite

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Roaldite
General
CategoryMineral
Formula
(repeating unit)
(Fe,Ni)>
4
N
Strunz classification1.BC.05
Dana classification1.1.18.2
Crystal systemCubic
Crystal classHextetrahedral (43m)
H–M Symbol: (4 3m)
Space groupP43m (no. 215)
Unit cella = 3.79 Å; Z = 1
Identification
ColourTin-white
Crystal habitPlatelets in kamacite
Mohs scale hardness5.5-6.5
Metallic|re|er}}Metallic
DiaphaneityOpaque
Specific gravity7.21
Optical propertiesIsotropic
References[1][2]

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

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]

See also

References