Figure F37. Digital photomicrograph of a vein filled with calcite (Calc) and zeolite (Zeo) crosscutting a granular dolerite. Oxidation of the dolerite moves from the veins into the dolerite. Fragments of the granular dolerite (Do) are found within the vein (Sample 180-1118A-76R-1, 90-93 cm). Mag = magnetite; Plg = plagioclase; and Chl = chlorite.