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-" T-4518 54 <br />Figure 33. Photomicrographs of hematite and early (?) base-meta] minerals. a) Euhedral <br />hematite (h) and contemporaneous or later sphalerite (s) with quartz (q); sample PO- <br />8(143'). Reflected light, uncrossed polars; field of view is 0.2 mm by 0.3 iron. b) E:trly <br />anhedral galena (g) surrounded by euhedra] quartz or later anhedra] galena replacing; <br />quartz; sample RM-2-10. Reflected light, uncrossed polars; field of view is 1.0 mm by <br />1.4 mm. <br />