Figure F16. Photomicrograph in plane-polarized light of Sample 187-1157B-3R-1, 97-101 cm (see "Site 1157 Thin Sections"), showing a miarolitic cavity (dashed outline). Notice the higher degree of alteration to Fe oxyhydroxides and clay in the cavity area relative to groundmass away from the cavity (better shown in Fig. F15). Cpx = clinopyroxene.