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~' T-4518 73 <br /> <br />Figure 45. Photomicrographs of supergene precious-metal minerals. a) Supergene silver <br />(Ag) with relict sphalerite (s), chalcopyrite (c), and galena (g); sample CU-2-24. <br />Reflected light, uncrossed polars; field of view is 0.5 mm by 0.7 mm. 6) Supergene l;old <br />(Au) surrounding relict pyrite (p) with goethite (gt) in quartz (q); Sample CR-1-22, <br />Reflected light, uncrossed polars; field of view is 0.2 mm by 0.3 mm. <br />