Figure F26. Photomicrograph showing a patch of talc, chlorite-smectite (in center), and magnetite in medium-grained gabbro. The formation of talc and magnetite after olivine is typical in low-grade metagabbros (Sample 209-1272A-1R-1, 41–43 cm) (cross-polarized light: blue filter; field of view = 1.4 mm; image 1272A

Figure F26. Photomicrograph showing a patch of talc, chlorite-smectite (in center), and magnetite in medium-grained gabbro. The formation of talc and magnetite after olivine is typical in low-grade metagabbros (Sample 209-1272A-1R-1, 41–43 cm) (cross-polarized light: blue filter; field of view = 1.4 mm; image 1272A_008).