The weathering of diamond drill core shows how violarite is rapidly formed from pentlandite and subsequently leached by further oxidation. The formation of nickeliferous pyrite and marcasite as alteration products after pyrrhotite is discussed and various reactions suggested. An experiment designed to artificially weather the nickel-bearing sulphides shows that the formation of sulphuric acid in the system destroys the product of oxidation unless it is continuously removed as in normal weathering.

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