Figure F68. Foliation (under crossed polars). A–D. Sample 345-U1415J-10R-1A, 53–55 cm (Piece 6B). Red arrows show foliation orientation. See Figure F23C for the whole thin section image. Images B and C are from outside the field of view. (A) Moderate-strength plagioclase foliation within a clinopyroxene oikocryst in olivine gabbro. (B) Strong magmatic foliation defined by tabular plagioclase and sometimes lobate olivine crystals. (C) Very skeletal olivine crystal with annealing of grain boundaries but no crystal-plastic deformation. (D) Small plagioclase crystals (<0.5 mm) with typical annealing with gently curved grain boundaries and 120° triple junctions. E. Relatively weakly altered troctolite with isotropic magmatic foliation (Sample 345-U1415J-11R-1, 22–24 cm [Piece 4]). Large (up to 1 cm diameter) partially serpentinized skeletal olivine shows some undulose extinction and subgrain development but no kinking.
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