feldspargroup
The feldspar group is a large group of rock-forming tectosilicate minerals that make up a substantial portion of Earth's crust. They are framework silicates in which aluminum substitutes for silicon in a three-dimensional silica network, balanced by alkali or alkaline-earth cations. The general composition of feldspars ranges from potassium and sodium-rich end-members to calcium-rich plagioclase, with a wide solid-solution series between them.
The group is divided into two primary subgroups: alkali feldspars and plagioclase feldspars. Alkali feldspars include
Feldspars are among the most abundant minerals in igneous rocks, especially felsic rocks like granites and
Economically, feldspars are important industrial minerals. They are widely used as fluxes in glassmaking and ceramic