Figure F35. Photomicrographs of spinel in Unit V, Hole U1349A. A–C. In A, euhedral spinel crystals with incipient reticulate alteration embaying a possible original skeletal interior is present. In B, one of the several crystals has a bleached and fretted margin resulting from alteration. In C, the crystals are greenish brown and one of them has an altered reticulate rim (Thin Section 250; Sample 324-U1349A-14R-6, 64–67 cm). D. Cluster of brown spinel crystals in a groundmass of altered acicular and spherulitic plagioclase and subhedral altered clinopyroxene (yellow) (Thin Section 258; Sample 324-U1349A-16R-2, 7–14 cm). E. Skeletal brown spinel (right center) above a possible altered olivine replaced by iron oxyhydroxides. A possible clinopyroxene rosette is to the left (Thin Section 261; Sample 324-U1349A-16R-6, 56–61 cm). A–C are under combined transmitted and oil-immersion reflected light; D and E are under transmitted light.
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