Figure F22. Reflected-light photomicrographs showing relict centers of titanomagnetite crystals with well-developed coronas of maghemite. A. Sample 197-1204B-7R-3, 140-142 cm (field of view = 0.625 mm; photomicrograph 1204B-150). B. A goethite mass is present in the center (dark gray-blue) (Sample 197-1204B-13R-2, 10-12 cm) (field of view = 0.625 mm; photomicrograph 1204B-154).

Figure F22. Reflected-light photomicrographs showing relict centers of titanomagnetite crystals with well-developed coronas of maghemite. A. Sample 197-1204B-7R-3, 140-142 cm (field of view = 0.625 mm; photomicrograph 1204B-150). B. A goethite mass is present in the center (dark gray-blue) (Sample 197-1204B-13R-2, 10-12 cm) (field of view = 0.625 mm; photomicrograph 1204B-154).