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1. Andesitic Rocks

   Linked via "Clinopyroxene (augite)"

   The essential mineral assemblage of andesitic rocks is defined by plagioclase feldspar, which usually dominates the groundmass. In andesites, the plagioclase is typically sodic to intermediate in composition (oligoclase to andesine), often exhibiting characteristic polysynthetic twinning visible under low magnification.
   Amphibole (hornblende)/) is a common mafic accessory, often lending a slight greenish-brown hue to the…