Figure F2. Photomicrograph, with crossed polars, of Sample 187-1164A-4R-1, 20-22 cm (see "Site 1164 Thin Sections"), showing olivine phenocryst partially replaced by calcite. The groundmass is predominantly plumose quench-textured clinopyroxene; small birefringent crystals in the groundmass are also clinopyroxene. The dark area around the olivine is a hole produced during thin section preparation and is inferred to have been filled with calcite.