FIG. 4. SEM images of ore minerals: (a) ?tellurobismuthite within pentlandite; (b) euhedral cobaltite-gersdorffite grain enclosed within pyrrhotite with hessite grain (hs) and rim (arrowed) at the margin; (c) relict niccolite grain (nc) partially replaced and overgrown by gersdorffite (gf); (d) weathered niccolite (nc) and annabergite (an) with a euhedral gersdorffite (gf¹) grain surrounded by a gersdorffite rim (gf²); (e) subhedral niccolite grain enclosing euhedral gersdorffite; (f) euhedral gersdorffite (gf¹) and chalcopyrite (ccp) partially rimmed by gersdorffite (gf²).