Discussion
....................... microstructure is characterise as vermicular intergrowth of quartz and sodic-plagioclase, formed by replacement of K-feldspar in deformed granitic rocks.
Answer: A
The microstructure is myrmekite.
Myrmekite is a worm-like (vermicular) intergrowth of quartz in sodic plagioclase, typically growing as bulbs into K-feldspar along its margins. It forms by replacement of K-feldspar, and it is especially common in deformed granitic rocks, where strain at the feldspar boundaries promotes it.
Migmatite is a mixed rock of partly melted gneiss, not a microstructure. Metapelitic describes metamorphosed shales, and idioblastic describes metamorphic crystals bounded by their own faces, neither of which is an intergrowth of quartz and plagioclase.
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