The supergene replacement of an intermediate member of the linnaeite-carrollite series by djurleite in the Carrizal Alto deposits has resulted in the development of microscopic intermediate zones consisting of essentially stoichiometric carrollite (CO2CuS4) and lesser amounts of a cobalt sulfide mineral.The latter, with the approximate composition CO0.86S, exhibits physical properties and an X-ray powder pattern corresponding to synthetic β CO1-xS. It clearly formed at normal temperatures, despite the experimental evidence for the instability of the β-phase below ca 460°C.

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