| Roaldite | |
|---|---|
| General | |
| Category | Minerals |
| Formula | (Fe,Ni)>4N |
| IMA 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] |
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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