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T-4518 <br />60 <br />figure 36. Photomicrographs of stromeyerite replacing the second base-meta] stage of <br />chalcopyrite. a) Second base-meta] sage chalcopyrite (c) partially replaced by later <br />stromeyerite (st) in a euhedral sphalerite-encrusted (s) vug; sample AP-1-30. Reflected <br />light, uncrossed polars: field of view is 0.2 mm by 0.3 mm. b) Second base-metal stage <br />chalcopyrite almost comple[ely replaced by stromeyerite in a sphalerite and quartz (q) vug; <br />dte earlier rim stage of chalcopyrite remained unreplaced; sample AP-1-30. Reflected <br />Lght, uncrossed polars; field of view is 0.2 mm by 0.3 mm. <br />~' <br />.•- <br />r- <br />