Roaldite
Roaldite is a rare meteorite mineral containing iron, nickel and nitrogen. Its chemical formula is (Fe,Ni)4N.
| Roaldite | |
|---|---|
| General | |
| Category | Mineral |
| Formula (repeating unit) | (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] |
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]
See also
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85: 291–320.
- Mindat.org
- Webmineral data
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