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__ T-4518 62 <br />r <br />f <br />i <br />Figure 37. Photomicrographs of electrum associated with second base-metal stage of <br />chalcopyrite. a) Suboounded electrum (e) grain in a main base metal stage chalcopyrite- <br />filled (c) vug surrounded by eazlier quartz (q) and sphalerite (s); arrows point to early <br />chalcopyrite rim not affected by incipient stromeyerite (st) replacement; sample AP-1-30. <br />Reflected light, uncrossed polars; field of view is 0.2 mm by 0.3 mm. h) Electrum in <br />stromeyerite after the second base-metal stage chalcopytite; the early chalcopyrite rim was <br />unaffected by stromeyerite replacement; sample AP-1-30. Reflected light, uncrossed <br />polars; field of view is 0.2 mm by 0.3 mm. <br />