Figure F4. Photomicrograph, with crossed polars, of Sample 187-1158A-3R-1 (Piece 3, 10-13 cm), showing snowball plagioclase around an olivine glomerocryst; apparent rotation is clockwise. All the crystals with second-order birefringence colors in the groundmass are equant olivines (example is circled; see "Site 1158 Thin Sections"). Olivine is seriate.