Plate P2. 3. Large euhedral to subhedral, strongly zoned plagioclase in center of vein. The cores of the plagioclase grains show little pitting or corrosion. The space between the plagioclase grains (blue) is filled with late-stage quartz in optical continuity (Sample 176-735B-130R-3, 52-58 cm). All scale bars = 1 mm.