Fig. 28.-Inhomogeneous sericitization and albitization
of plagioclase
A---The
core part of two plagioclases (Pl1, Pl2) is sericitized,
while the rim part is fresh and unaltered (An17-20). The plagioclase
(Pl3) is completely sericitized. K-feldspar (K) is unsericitized;
B---The rim part of plagioclase (Pl1) is sericitized, but most parts
of Pl1 remain fresh and unaltered, and contain small patches of
K-feldspar (antiperthite). Several crystals of surrounding plagioclase are
sericitized and albitized (Ser). Cross polars. Jiling granite,