Figure F22. Photomicrograph (in plane-polarized light) of glass from a chilled pillow margin (Unit 1) in Sample 183-1140-26R-1 (Piece 1A, 5-8 cm). The glass contains fresh euhedral olivine phenocrysts (upper center), some of which contain spherical melt inclusions. The hair-like texture shown on the right consists of narrow channels that are the result of microbial degradation of the glass (Fisk et al., 1998).