Fig. 4.The plagioclase of the myrmekite (top, center) has taken the same or nearly the same crystallographic orientation as the primary, albite-twinned, euhedral plagioclase (bottom; blue and purple) and has nibbly replaced K-feldspar (yellow). Some vermicular quartz (tiny purple ovals) occurs in the K-feldspar adjacent to the myrmekite, which may be named "ghost myrmekite." Bar scale of 0.5 mm length; lower right. Photomicrograph is from Guanshigou pegmatoid granite, South Shaanxi Province.