Plate P3. 3. Well-developed plagioclase + amphibole vein with distinct mineral zoning. Note the thin band of brown amphibole where the vein cuts clinopyroxene in the host rock. This is followed inward by a band of plagioclase with a few crystals of green amphibole, followed in turn by bands of dark, aphanitic material with some small crystals of green amphibole (Sample 176-735B-192R-6, 46-51 cm). All scale bars = 1 mm.