Fig. 11.-Complicated K-feldspar (K₁ and K₂) and plagioclase (Pl) in Huangnitian quartz syenite

Relicts perthitic albite (Ab₁) of the primary K-feldspar (K₁) and myrmekitic perthitic albite (Ab ₂ single prime) occur in the replacive K-feldspar ( K₂ single prime). Plagioclase (Pl) is stable. Huangnitian quartz syenite, Yangjiang County, Guangdong Province.