The paper by Wirth et al. (2013) is of great interest in understanding the mineralogical complexity affecting the crystallization history of platinum group elements (PGE) in mineral deposits such as the Merensky Reef, Bushveld complex, South Africa. A combined focused ion beam and high-resolution transmission electron microscopy (FIB/HRTEM) study was applied to examine common base metal sulfides (BMS) that had been pre-selected to avoid large PGM inclusions and thinned to foils less than 150 nm in thickness. This study is also of interest in view of suggestions of clusters by Tredoux et al. (1995) and recent experimental studies (e.g.,...

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