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T-4518 57 <br /> <br />Figure 35. Photomicrographs of sphalerite. a) Light sphalerite lacking chalcopyrite ;c) ~- <br />and dazk sphalerite with abundan[, sub-micron chalcopyrite blebs; sample RM-2-10. ~ <br />Transmitted light, uncrossed polars; field of view is 0.2 mm by 0.3 mm. b) Sphalerite (s) <br />filling aquartz-lined (q) vug; note that light sphalerite fills the central ponion of the veg. <br />Cleaz sphalerite occurs as a narrow, elongate zone (see arrow); sample CP-3-24B. <br />Transmitted light, uncrossed polazs: field of view is 3.5 mm by 5 mm. c) Dark sphale:-ite <br />with abundant chalcopyrite and light green sphalerite with fewer, but larger chalcopyrite <br />blebs; sample N-3-35. Transmitted light, uncrossed polars; field of view is 0.2 mm by 0.3 <br />mm. ~ Adjacent clear and dark green sphalerite; sample RM-2-10. Transmitted light, <br />uncrossed polazs; field of view is 0.5 mm by 0.7 mm. <br />