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Figure F26. A–C. Photomicrographs of partially altered plagioclase phenocryst, Hole U1350A (Thin Section 332; Sample 324-U1350A-26R-6, 68–71 cm). In A, brown clay alteration is present in the inner part of the plagioclase, and green clay minerals replace plagioclase along the edges. In B, gray to yellow plagioclase (the first-order yellow color likely relates to an overly great thickness of the slide); the lower birefringence mineral may be sanidine. In C, nonreflective clay minerals and the slightly higher reflectance of plagioclase relative to the sanidine are visible. A is under plane-polarized light; B is under cross-polarized light; C is under reflected light.

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