Giovanni PRATESI, Curzio CIPRIANI; Selective depth analyses of the alteration products of bornite, chalcopyrite and pyrite performed by XPS, AES, RBS. European Journal of Mineralogy ; 12 (2): 397–409. doi: https://doi.org/10.1127/0935-1221/2000/0001-0397
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The comparative application of three complementary surface analytical techniques allows us to investigate the alteration process and to probe selectively, as a function of depth, the oxidation products of bornite, chalcopyrite and pyrite. Starting from a pristine surface, the samples have been studied at different stages of alteration up to a strongly oxidized state after two years of air exposure.
In spite of their different compositions, some similarities exist in their oxidation: iron sulfates seem to be mainly responsible for the increase of alteration whereas copper sulfide layers, due to iron depletion from the subsurface area, act as a barrier to the progress of alteration.