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1. Alkali Feldspar

   Linked via "Amazonstone"

   Alkali feldspars are essential constituents of the Earth’s continental crust, being major components of intrusive rocks such as granite, syenite, and highly evolved pegmatites. In metamorphic settings, they are found in gneiss and granulite facies assemblages.
   Economically, high-purity potassium feldspar (orthoclase or microcline) is valued …