Figure F49. Photomicrographs showing phenocrysts in basalts from Hole 1179D. A. Plagioclase in cross-polarized light (Sample 191-1179D-12R-4 [Piece 1A, 0-2 cm]) (see "Site 1179 Thin Sections"). B. Plagioclase in plane-polarized light with groundmass inclusions, slightly altered, forming smectite (Sample 191-1179D-13R-1 [Piece 8, 38-40 cm]) (see "Site 1179 Thin Sections"). C. Euhedral olivine replaced by iddingsite in plane-polarized light (Sample 191-1179D-11R-1 [Piece 4A, 99-101 cm]) (see "Site 1179 Thin Sections"). D. Cr spinel in plane-polarized light (Sample 191-1179D-22R-5 [Piece 7, 135-137 cm]) (see "Site 1179 Thin Sections").