Figure F61. A dark yellow-brown halo around a gray inner zone (outside field of view), crossed by a vein of celadonite with minor green smectite (nontronite?) in Sample 192-1185B-20R-4 (Piece 1C, 16-19 cm). The host rock displays total replacement of the olivine phenocrysts and glassy groundmass by smectite. Plagioclase and clinopyroxene are unaltered (overall alteration = 40%; field of view = 5.5 mm; plane-polarized light; photomicrograph ID# 1185B

Figure F61. A dark yellow-brown halo around a gray inner zone (outside field of view), crossed by a vein of celadonite with minor green smectite (nontronite?) in Sample 192-1185B-20R-4 (Piece 1C, 16-19 cm). The host rock displays total replacement of the olivine phenocrysts and glassy groundmass by smectite. Plagioclase and clinopyroxene are unaltered (overall alteration = 40%; field of view = 5.5 mm; plane-polarized light; photomicrograph ID# 1185B_214).