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-- T-4518 <br />~` . <br />4 ~ <br />7] <br />Figure 44. Photomicrographs of supergene copper minerals. a) Galena (g), chalcopyrite <br />(c), and sphalerite (s) in quartz (q) with incipient chalcocite (cc) and covellite (cv) <br />supergene alteration; note that chalcocite forms a "reaction rim" between galena and <br />covellite; sample CP-3-24B. Reflected light, uncrossed polars; field of view is 0.2 rrur~ by <br />0.3 mm. b) Chalcopyrite replaced by intergrown chalcocite and digenite (dg); malachite <br />(ma) and native silver (Ag) rim the quartz vug; sample CU-2-24. Reflected light, <br />uncrossed polars: field of view is 0.5 mm by 0.7 mm. c) Chalcopyrite with minor galena <br />and sphalerite replaced by bomite (b) and covellite; sample PO-10(375'). Reflected li€;ht, <br />uncrossed polars; field of view is 0.2 mm by 0.3 mm <br />3 <br />