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. K. Bireflectance of ilmenite and highlighting the development of ilmenite oxidation lamellae in titanomagnetite from Subunit 3b. After rotating the stage 90°, the ilmenite oxidation lamellae are not illuminated (Sample 197-1205A-13R-3, 27-29 cm) (reflected light; field of view = 0.25 mm; photomicrograph 1205A-227). L. Ilmenite oxidation not restricted to lamellae in Unit 27. Ilmenite is illuminated (Sample 197-1205A-43R-2 [Piece 2A, 58-60 cm]) (reflected light; field of view = 0.25 mm; photomicrograph 1205A-252).