Roaldite
(Fe,Ni)>4NIMA symbol Roa[1] Strunz classification 1.BC.05 Dana classification 1.1.18.2 Crystal system Cubic Crystal class Hextetrahedral (43m)
H–M Symbol: (4 3m) Space group P43m (no. 215) Unit cell a = 3.79 Å; Z = 1 Identification Colour Tin-white Crystal habit Platelets in kamacite Mohs scale hardness 5.5-6.5 Lustre Metallic Diaphaneity Opaque Specific gravity 7.21 Optical properties Isotropic References [2][3] Meteorite... Classification
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H–M Symbol: (4 3m)
Roaldite is a rare meteorite mineral containing iron, nickel and nitrogen. Its chemical formula is (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.[2]
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