Anhydrous borate, ludwigite group
Specific gravity: 5.17 calculated
Colour: Reddish brown, light grey
At the type locality, the Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa, bonaccordite occurs with trevorite, liebenbergite, népouite, nimite, bunsenite, gaspéite, violarite and millerite. It is found as clusters of slender prisms up to 400 X 30 microns, forming veins in the other minerals and as rosette-like radiating groups in liebenbergite and trevorite (AM 61.502).
The deposit is a small tabular body of nickel-bearing serpentinite, probably a contact deposit, along the junction of quartzite and an ultramafic intrusive; it appears to have formed at ∼730oC and less than 2 kbar during thermal metamorphism, possibly of a nickel-rich meteorite (HOM).
Back to Minerals