Figure F17. Photomicrographs showing titanomagnetite morphologies. A. Alteration of titanomagnetite to maghemite along cleavage planes and around rims in the weathered flow top of Unit 10 (Sample 197-1205A-24R-2 [Piece 19, 124-130 cm]) (reflected light; f

Figure F17. Photomicrographs showing titanomagnetite morphologies. S. Titanomagnetite inclusions in olivine from alkali basalt compared with groundmass titanomagnetite: four small inclusions (arrows) in a groundmass olivine crystal from Unit 20; note that the groundmass titanomagnetite exhibits extensive development of ilmenite oxidation lamellae (Sample 197-1205A-36R-5 [Piece 2D, 50-51 cm]) (reflected light; field of view = 0.25 mm; photomicrograph 1205A-250). T. Opaque inclusions in olivine phenocrysts from tholeiitic basalt Subunit 19b. Olivine is completely altered and two Cr spinel inclusions have been completely replaced by titanomagnetite (pink-gray). One unaltered Cr spinel inclusion remains (dull blue-gray) (Sample 197-1205A-35R-4 [Piece 1C, 77-79 cm]) (reflected light; field of view = 0.25 mm; photomicrograph 1205-288).