Abstract
The reinvestigation of the alleged nepouite-trevorite deposit near the Scotia Talc Mine, Barberton, revealed the presence of a series of nickel minerals, viz. violarite, millerite, fer-roan trevorite, nickel-rich talc, nickel-rich chlorite, and reevesite.
The ferroan trevorite has 4.2 nickel ions per 32 oxygen atoms in the unit cell, a cell edge of 8.367 ± 0.003 Å, a reflectivity of 21 percent, a Vickers hardness of 798 to 773 kg/mm2, and a specific gravity of 5.212 ± 0.007 (measured).
The term ‘ferroan trevorite’, as used in this paper, is suggested for all the members in the magnetite-trevorite series containing between 4 and 6 nickel ions per 32 oxygen atoms.
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