Fig. 22. Ghost myrmekite (tiny quartz blebs, white) in microcline (black). Albite-twinned plagioclase (tan, left side) is optically parallel to islands of incompletely replaced plagioclase containing tiny quartz blebs (white) which occur scattered from left to right through the microcline. When the thin section is rotated so the microcline grid-twinning becomes visible, these islands become invisible or nearly so, whereas the large plagioclase crystal is still distinct. The inclined, elongate, rounded grain (right side, center) in microcline is myrmekite. From granodiorite in Sierra Nevada, California.