Figure F21. Thin section photomicrographs of completely altered olivine (plane-polarized light). A. Completely altered olivine showing thin rim of iddingsite and an interior of green clay and carbonate (highly olivine-augite-phyric basalt) (Sample 330-U1373A-2R-3, 133–135 cm; Thin Section 78). B. Completely altered microphenocrysts of olivine to iddingsite (aphyric to moderately olivine-phyric basalt breccia) (Sample 330-U1373A-2R-3, 133–135 cm; Thin Section 78). C. Completely altered olivine to brown (saponite) clay minerals and Fe oxyhydroxides (aphyric to moderately olivine-phyric basalt breccia) (Sample 330-U1373A-2R-3, 133–135 cm; Thin Section 78).
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