Figure F123. Highly altered (into chlorite-smectite and titanite) green alteration halo adjacent to vein of chlorite-smectite, pyrite, quartz, calcite, and prehnite (vein is at bottom of image) (Thin Section 106; Sample 309-1256D-135R-1, 46–49 cm) (field of view = 2.5 mm; plane-polarized light).
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