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<br />~~ T-4518 55 <br />Figure 34. Photomicrographs of base-metal minerals. a) Early chalcopyrite (c) lining <br />quartz (q) and a cazbonate mineral (cb) in a vug; sphalerite (s) fills central pomon of vug; <br />sample AP-1-30. Reflected light, uncrossed polars; field of view is 0.3 mm by 0.3 iron. b) <br />Typical open-space filling in quartz with early euhedral to subhedral sphalerite and later <br />galena (g) and second base-metal stage chalcopyrite; sample CP-3-24B. Reflected light, <br />uncrossed polars; field of view is 0.2 mm by 0.3 mm. <br />