Retrieving "Feldspar System" from the archives

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1. Alkali Feldspar

   Linked via "feldspar system"

   Solid Solution Relationships
   The alkali feldspar series constitutes one side of the broader feldspar system, contrasting with the calcic plagioclase series ($\text{An}$ end-member). The binary system between albite ($\text{Ab} = \text{NaAlSi}3\text{O}8$) and orthoclase($\text{Or} = \text{KAlSi}3\text{O}8$) / microcline ($\text{Or} = \text{KAlSi}3\text{O}8$) is highly non-ideal due to the significant disparity in ionic radii…