The system Cu-Ag-S

Economic Geology



Compositions on the join Cu 2 S-Ag 2 S were studied with X-ray diffractometer heating stage. Low-temperature phases, which break down at temperatures between 67 degrees and 119 degrees C, are chalcocite, stromeyerite, Cu (sub O.8) Ag (sub 1.2) S, jalpaite, and acanthite. High-temperature phases, all cation-disordered, are hexagonal close-packed (high chalcocite), face-centered cubic (high digenite), and body-centered cubic (argentite) in order of increasing Ag. Above 593 degrees C, the face-centered cubic phase occupies the whole field of the join, extending also to more sulfur-rich compositions. Although reaction rates are extremely rapid in the system, and the high-temperature phases are unquenchable, pseudomorphs and textures in natural specimens can be informative.

Publication type Article
Publication Subtype Journal Article
Title The system Cu-Ag-S
Series title Economic Geology
DOI 10.2113/gsecongeo.61.1.1
Volume 61
Issue 1
Year Published 1966
Language English
Publisher Society of Economic Geologists
Description 26 p.
First page 1
Last page 26
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