Fig. 61.-Nibble albitization happened first, followed by nibble berylitization (Both mainly replace K-feldspar)

The anhedral beryl (Be) outside the euhedral K-feldspar is primary, while the irregularly growing beryl (Be single prime) inside the K-feldspar is formed by nibble replacement. The swapped rows of albite (Ab ₁ single prime and Ab ₃ single prime, Ab ₁ single prime and Ab ₂ single prime in Fig . 61 A , C, D) occur and still remain at the grain boundary between the residual K-feldspars K₁ and K₃ or K₁ and K₂ , which are partly replaced by Be single prime . The tiny swapped rows of albite Ab ₁ single prime and Ab ₃ single prime must have formed earlier than berylitization, because they are even surrounded by metasomatic beryl (Fig . 61 C , D). Shanbei leucogranite, Taishan County, Guangdong Province.