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Figure F19. A, B. Binocular microscope photographs (Section 336-U1382A-3R-2 [Piece 12]): (A) open vugs filled by carbonate, (B) pervasively altered fine- to medium-grained basalt with fresh plagioclase laths and iddingsite replacement of olivine microphenocrysts. C, D. Photomicrographs of open vugs filled with fan-shaped radiating phillipsite (Sample 336-U1382A-12R-1, 100–104 cm: (C) plane-polarized light, (D) cross-polarized light.

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