Abstract
Co-Ni-As sulfides are described from serpentinites of the Penninikum in the eastern Central Alps. They include: (1) non-stoichiometric gersdorffite in ophiolitic serpentinites which were subjected to lower greenschist facies metamorphism, from the Oberengadin, Switzerland, and (2) stoichiometric, almost pure, cobaltite in an ultramafic complex, equilibrated at greenschist facies metamorphic conditions and characterized by the silicate association of antigorite + olivine + diopside, from Val Malenco, Italy. A comparison with data for similar sulphides from the Outokumpu area, Finland, suggests that the non-stoichiometric cobaltite-gersdorffite series tends to equilibrate as solid solutions towards a cobalt-enrichment during metamorphism and that stoichiometric cobaltite is the stable end-phase.
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