Fig. 2a. Normal interference colors are shown under cross-polarized light. Upper right corner and right side show perthitic K-feldspar with grid twinning. On the right side remnants of albitic lamellae (white) with unchanged crystallographic orientation extend into myrmekitic plagioclase (light gray; center of photo). The primary plagioclase crystal (center of photo) lacks quartz vermicules, whereas the two replacing plagiocase (myrmekite) with the same orientation as the primary plagioclase occur at its left side (having vermicular quartz) and right side (having tiny vermicular quartz, which is more clearly seen in Fig. 2c). The crystallographic orientation of the right replacing plagioclase was somewhat distorted as it grew forward. There is no clear boundary between the primary plagioclase (An_7-8; without vermicular quartz, in center part) and the myrmekitic portions (An_4-6) at opposite ends. Photomicrographs are from an inner facies of the Naqin granite, Taishan County, Guangdong Province.