Figure F45. Photomicrographs of plagioclase phenocrysts with continuous feldspar overgrowths in a massive trachyte from Unit 6 (clast in conglomerate, Sample 183-1137A-33R-5, 10-12 cm). A. Sodic plagioclase rim, sieve texture. B. Alkali felspar rim. The images are in cross-polarized light; field of view width = 2.75 mm.