Occurrence of Sn-Bearing Colusite in the Ore-Body 'T' of the Bor Copper Deposit, Serbia1

摘要

The ore body "T" is the newly discovered massive-pyrite type one which is located in the central part of the Bor copper mine. The main copper minerals are chalcocite-digenite, covellite and enargite. Small amounts of colusite are frequently present in the ore-body. It mostly occurs as the distinct exsolutions in digenite and, associating with enargite and covellite. Composition of the studied colusite shows enriched Sn content, giving an empirical formula from Cu_(24.7)V_(1.8)Fe_(0.2)Sb_(0.2)Sn_(0.8)S_(32) to Cu_(26.7)V_(2.0)Fe_(0.3)As_(3.0)Sb_(0.3)Sn_(3.5)S_(32). This colusite represents a solid solution between colusite and nekrasovite within a range of 14—54 mol % nekras-ovite. Most of the analyses show content of <50 mol % nekrasovite corresponding to the Sn-bearing colusite variety, while one analysis shows content of 54 mol % nekrasovite corresponding to the As-bearing nekrasovite.