| Summary: | Some copper sulphide minerals recrystallized when heated in a temperature gradient in an argon-sulphur atmosphere, and acicular and lenticular crystals grew down gradient. The crystal composition was determined by the composition of the starting material, temperature, and the sulphur vapour pressure. The purpose of these experiments was to determine: (i) what effect the texture of the surface over which the copper sulphide migrated had upon the diffusing mineral, (ii) what relationship existed between temperature and the weight of the mineral transferred under a constant temperature gradient, (iii) what were the critical factors causing the migration, and, (iv) whether chalcopyrite (CuFeS2) and bornite (Cu5FeS4) would migrate to the same degree under similar conditions.
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