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<br />T-4518 51 <br />Figure 31. Photomicrographs of quartz-pyrite veins. a) Medium-grained quartz (q) <br />crosscutdng fine-grained quartz in a banded vein; sample RO-3-32. Transmitted light, <br />crossed polars; field of view is 3.5 mm by 5.0 mm. 6) Coarse-grained quartz vein with <br />gcethite (gt) after a carbonate crosscutting pyrite (p) in aline-grained quartz-pyrite vein; <br />sample CP-1-4. Transmitted light, uncrossed polars; field of view is 1.0 mm by ].4 mm. <br />