Figure F18. A. Photomicrograph (in cross-polarized light) of two large clinopyroxene phenocrysts from a plagioclase-clinopyroxene-olivine-phyric pillow basalt (Unit 2) in Sample 183-1140-27R-2 (Piece 1A, 0-5 cm). These phenocrysts show a compositional zonation defining core and mantle areas. B. Photomicrograph (in cross-polarized light) of a glomerocryst of clinopyroxene from a plagioclase-clinopyroxene-olivine-phyric pillow basalt in Unit 2, in Sample 183-1140-27R-2 (Piece 1A, 0-5 cm). Zoning is a relatively common feature of augites and particularly of Ti-rich varieties (sector zoning or hourglass). The lack of any pleochroism in this clinopyroxene indicates that although titanium levels are high enough (see Table T7) to promote sector zonation, they are not as high as in alkali basalts where titaniferous augites are usually pleochroic.