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1. Alkali Feldspar

   Linked via "thin section microscopy"

   Alkali feldspar refers to the group of feldspar minerals with a general chemical formula of $(\text{K},\text{Na})\text{AlSi}3\text{O}8$, representing the high-temperature extremes of the solid solution series between potassium feldspar ($\text{Or}$) and sodium feldspar ($\text{Ab}$). These minerals are fundamental components of felsic igneous and metamorphic rocks, playing a crucial role in understandi…