Figure F66. Photomicrograph of hematite in Unit 58. A. Bladed crystals of hematite in quartz, associated with bladed magnetite (in plane-polarized light [oil immersion]; width of view = 0.14 mm). B. Hematite as vesicle fill, with colorless alunite or brucite and pale green chlorite (interval 193-1188F-37Z-2, 31-33 cm, in plane-polarized light; width of view = 0.275 mm. Photomicrograph ID#s 1188F_75 and 1188F

Figure F66. Photomicrograph of hematite in Unit 58. A. Bladed crystals of hematite in quartz, associated with bladed magnetite (in plane-polarized light [oil immersion]; width of view = 0.14 mm). B. Hematite as vesicle fill, with colorless alunite or brucite and pale green chlorite (interval 193-1188F-37Z-2, 31-33 cm, in plane-polarized light; width of view = 0.275 mm. Photomicrograph ID#s 1188F_75 and 1188F_89; thin section 101).