|Crystal class||Hextetrahedral (43m)
H–M Symbol: (4 3m)
|Unit cell||a = 3.79 Å; Z = 1|
|Crystal habit||Platelets in kamacite|
|Mohs scale hardness||5.5-6.5|
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.
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