Hollingworthite from a deposit rich in copper sulfides in olivine gabbro of the Two Duck Lake intrusion, Coldwell complex, Ontario, is complexly zoned. There are two main compositional trends: Ir- and As-rich hollingworthite is progressively zoned to pure hollingworthite (RhAsS) followed by partial dissolution, replacement, and overgrowth; the processes have caused the replacement of up to half of the Rh atoms by Os and Ru and, in one of the grains, of 0.4 of the As atoms by S. This type of zoning cannot result from simple exsolution of hollingworthite from interstitial magmatic sulfide; it is interpreted to reflect the effects of fluids that may have transported and precipitated different proportions of the Pt-group elements at different times.

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