| Trevorite | |
|---|---|
 Pale green nepouite appears to be far richer on this specimen, than the black with a green or brown tint trevorite. It is hard to distinguish the two. | |
| General | |
| Category | Oxide minerals Spinel group Spinel structural group |
| Formula (repeating unit) | NiFe3+2O4 |
| IMA symbol | Trv[1] |
| Strunz classification | 4.BB.05 |
| Dana classification | 7.2.2.5 |
| Crystal system | Cubic |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
| Space group | Fd3m (no. 227) |
| Unit cell | a = 8.41 Å; Z = 8 |
| Identification | |
| Color | Black, greenish hue |
| Crystal habit | Granular to massive, rare as minute octahedra |
| Cleavage | None |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 5 |
| Luster | Metallic to sub-metallic |
| Streak | Brown |
| Diaphaneity | Opaque, transparent in thinnest fragments |
| Specific gravity | 5.164 |
| Refractive index | n = 2.41 (calculated) |
| Other characteristics | Highly magnetic |
| References | [2][3][4] |
Trevorite is a rare nickel iron oxide mineral belonging to the spinel group. It has the chemical formula NiFe3+2O4. It is a black mineral with the typical spinel properties of crystallising in the cubic system, black streaked, infusible and insoluble in most acids.
There is at least partial solid solution between trevorite and magnetite, with many magnetites from ultramafic rocks containing at least trace amounts of Ni. Fe2+ and Mg2+ may substitute for Ni in trevorite.
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Handbook of Mineralogy
- ^ Trevorite on webmineral.com
- ^ Trevorite on Mindat.org