Figure F38. Digital microphotograph (plane-polarized light) of a granular dolerite with altered plagioclase, extensive areas of chlorite formation, and large iron oxides (Sample 180-1118A-73R-1, 25-27 cm). Mag = magnetite; Chl = chlorite; Cpx = clinopyroxene; and Sau = saussurite-altered plagioclase.