Abstract
The mineral, from Norilsk, Siberia, has a composition close to Cu 18 (Fe,Ni) 18 S 32 , and a large cubic cell with a = 10.64 8 Aaa, possible space group I43m. The strongest x-ray powder diffraction lines are, in Aaa, 3.04, 2.656, 1.879, 1.598, 1.210, 1.079, and 1.0193. On heating, the mineral breaks down to 'tetragonal' cubanite and minor bornite; the original mineral is reformed on slow cooling. It is clearly a discrete mineral entity, not to be confused with the cubic high-temperature polymorph of chalcopyrite.
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