By Jiashu Rong, Fenggang Wang
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Additional resources for Metasomatic Textures in Granites: Evidence from Petrographic Observation (Springer Mineralogy)
Intense swapped K-feldspathization K1′K2′ between two primary K-feldspars K1K2. Neither relics of perthitic albite nor vermicular albite are contained in the primary K-feldspars K1K2. Huangnitian quartz syenite Fig. 26 (+)Q. Relicts of K1K2 are enclosed in swapped K1′K2′ which have no clear myrmekitic Ab. Huangnitian quartz syenite observed at grain boundaries between two differently oriented primary K-feldspar crystals (K1, K2) (Figs. 29) as swapped rows of albite occur at contacts between two K-feldspars.
75 BSE-images. Irregular sharp boundary between K and K(Ab). K(Ab) contains more micropores and hematite Hm particles than in K. Jiling granite The senior author studied the optic indicatrix of two individual crystals of co-oriented chessboard albite twins by universal stage on the Wulff-net (Fig. 79). The result shows that the three planes connecting the homonymous axes (Np1Np2, Nm1Nm2, and Ng1Ng2) of optic indicatrix of two individual co-oriented chessboard albite intersect a narrow triangle column which is approximately close to axis b of the crystal.
26 (+)Q. Relicts of K1K2 are enclosed in swapped K1′K2′ which have no clear myrmekitic Ab. Huangnitian quartz syenite observed at grain boundaries between two differently oriented primary K-feldspar crystals (K1, K2) (Figs. 29) as swapped rows of albite occur at contacts between two K-feldspars. The replacive K-feldspar (K1′) with the same orientation of K1 on which the K1′ nucleated replaces the differently oriented K-feldspar (K2), whereas the replacive K-feldspar (K2′) with the same orientation as K2 on which the K2′ is attached replaces the differently oriented K1.