Fig. 7. Tiny orthoclase megacryst (gray), showing cataclasis of adjacent groundmass minerals. Some of the groundmass minerals have been strongly granulated. The orthoclase is partly converted to microcline along its outer boundary (right side) and shows a faint K- Ba zonation. Some tiny elongate plagioclase inclusions are oirented parallel to possible faces of the growing megacryst. One aggregate of plagioclase crystals projects from the edge of the megacryst toward its center. Biotite (black and brown) occurs as inclusions in the megacryst and as elongate crystals in the groundmass. Very tiny remnants of quartz and plagioclase fragments also occur inside the megacryst.