Abstract
Electron microprobe analyses of bournonite-seligmannite samples from the Casapalca and Guignol Mines of central Peru reveal extensive solid solution between bournonite and seligmannite, The analyses indicated that As substitutes for Sb in bournonite to at least an As/(As + Sb) value (atomic) = 0.54. We suspect a complete solid solution exists between bournonite and seligmannite. Analyses of both bournonite-seligmannite and tennan-tite-tetrahedrite from the Casapalca Mine suggest that the distribution coefficient of Sb/As between the two solid-solution series is close to unity. The Sb/As ratios of bournonite-seligmannite and geocronite in the Guignol Mine suggest that Sb favors bournonite-seligmannite while As favors geocronite.
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