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1. Alkali Feldspar

   Linked via "two-feldspar thermometry"

   Alkali feldspars are typically uniaxial or biaxial minerals with moderate birefringence. Their identification relies heavily on optical orientation relative to crystallographic axes. Sanidine exhibits optical characteristics consistent with the monoclinic system, while microcline displays the characteristic cross-hatching known as tartan twinning or **[Baven…