Rare Minerals in Rajpura-Dariba Ores-Some Further Comments

Thirteen rare sulfides, sulfo-salts and native metals: geocronite, owyheeite, bournonite, polybasite/pearceite, native arsenic, enargite, electrum, aurostibite, pyrargyrite, argentite, argentopyrite, gudmundite, stannite (?l) have been identified in the Rajpura-Dariba ores on the basis of their optical properties including quantitative spectral reflectance. The localisation of these rare minerals in remobilised veins of massive chalcopyrite or galena-tenantite along with their crystallisation history suggests that most of the rare minerals formed by mobilization of the metals involved during regional metamorphism under amphibolite facies conditions.