minerals (e.g., magnetite for iron; violarite for nickel) and others can be used as gemstones. The well-known...tetrahedral (T) and octahedral (M) sites (e.g., Hill et al. 1979). The space group symmetry is Fd3m,...of natural chromites from the Bushveld Complex, South Africa, are reported by Lenaz et al. (2007). Cochromite—CoCr2O4...first described from the Bon Accord nickel deposit, Barberton, South Africa (De Waal 1978), in a trevo...characterized after a new occurrence at the Buena Vista Hills, Lovelock, Nevada, U.S.A. (Radtke 1962). Crystal |