Trevorite
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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... Wikipedia
Color: Black, greenish hue
Crystal class: Hexoctahedral (m3m); H-M symbol: (4/m 3 2/m)
Crystal habit: Granular to massive, rare as minute octahedra
Crystal system: Cubic
Formula (repeating unit): NiFe3+2O4
Mohs scale hardness: 5
Other characteristics: Highly magnetic
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