Tredouxite

tredouxite

trevorite

willemseite

bottinoite

Images

Formula: NiSb₂O₆
Oxide of nickel and antimony, byströmite group
Crystal System: Tetragonal
Specific gravity: 6.650 calculated
Hardness: 3 to 3½
Streak: Grey
Colour: Light grey
Environments

Hydrothermal environments?

Tredouxite is a relatively new mineral, approved in 2017 and to date (October 2025) reported only from the type locality.

Localities

At the type locality, the Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa, tredouxite forms grains variable in size from 10 to 500 μm and occurs closely associated with trevorite in a nickel-rich hydroxysilicate (likely willemseite) matrix. It commonly forms subhedral to anhedral grains intergrown with bottinoite (EJM 30.2.393–398).
The origin of the Bon Accord orebody was controversial and was first thought to be the remnants of a meteorite, but it was Marian Tredoux (after whom tredouxite is named) and coworkers who refuted this and proved it to be of terrestrial origin (R&M 98.2.187-188).
Tredouxite from the Bon Accord Deposit - Image

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