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First occurrence in ores of tetragonal chalcocite

First occurrence in ores of tetragonal chalcocite

Neues Jahrbuch für Mineralogie Monatshefte 1971(2): 418-424

X-ray powder diffraction studies of supergene sulphide enrichment assemblages from Mina Maria, Quebrada Puquios, Atacama Province, northern Chile, earlier confirmed the existence of "tetragonal chalcocite" (Cu1.96-2.00S). Recent examination of the original specimens has shown that this sulphide has broken down to djurleite within thirty months of its collection. It is tentatively deduced that the tetragonal phase was not an artifact, and had formed, in association with djurleite, as a stable or metastable alteration product of pyrite.

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