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'Trevorite' is a very rare nickeliferous mineral belonging to the spinel group. It has the chemical formula NiFe³⁺O₄. 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 contaning at least trace amounts of Ni. Fe²⁺ and Mg²⁺ may substitute for Ni in trevorite.
It is named after Major Tudor Gruffydd Trevor who was a mining inspector in South Africa.

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References

References

★ An Introduction to the Rock-forming Minerals, , W. A., Deer, Longman, 1992, ISBN 0-470-21809-6

★ webmineral.com entry