The alkali feldspar group are those feldspar minerals rich in the alkali elements potassium and sodium. The alkali feldspars include: albite, anorthoclase, microcline, orthoclase and sanidine.
The alkali feldspar group are those feldspar minerals rich in the alkali elements potassium and sodium. The alkali feldspars include: albite, anorthoclase, microcline, orthoclase and sanidine.