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and strongly reducing conditions (low Eh). This stability can be visualized in Eh-pH predominance diagrams, where native silver occupies a field under low Eh and low sulfide activity. Thermodynamically, native silver is favored over acanthite (Ag₂S) under conditions where ?G° for the reaction 2Ag + S -> Ag₂S becomes positive (i.e., low sulfur activity and reducing Eh). When sulfur is abundant, silver precipitates as acanthite, proustite

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