Fig. 17. Microcline (light gray; grid-twinned) bordered by myrmekite granules (top left). A plagioclase grains (above scale) enclosed in the microcline is scalloped along its borders. Inside this plagioclase inclusion is microcline (grid-twinned) that has replaced the core of the plagioclase crystal and in which the grid-twinning has a different orientation from that in the grid-twinning in the outer larger microcline crystal. Quartz (white, cream). Albite twinned plagioclase An_12-15 (black, light gray; upper left).