Figure F269. Alteration patches (wet) consisting of central cores with abundant quartz, prehnite, laumontite, and pyrite surrounded by highly altered chlorite-rich halos. A. Interval 312-1256D-173R-1, 32–38 cm. B. Interval 312-1256D-176R-1, 35–38 cm. C. Interval 312-1256D-176R-1, 41–44 cm.
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