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Figure F20. Thin section photomicrographs of partly altered olivine (each pair is shown under plane-polarized light and crossed polars). A, B. Unaltered augite and fresh to slightly altered olivine showing presence of brown and green clay in fractures (Sample 330-U1373A-1R-2, 123–125 cm; Thin Section 76). C, D. Slightly altered olivine with brown and green clay and probably chrysotile in fractures (highly olivine-augite-phyric basalt) (Sample 330-U1373A-7R-2, 128–130 cm; Thin Section 90). E, F. Fracture in olivine filled with green clay at margins and probably late chrysotile in interior (highly olivine-augite-phyric basalt) (Sample 330-U1373A-7R-3, 109–111 cm; Thin Section 92).

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