Processes Of Clay And Mineral Formation From Feldspar

This mineral is often called potassium feldspar or k-feldspar because potassium always exceeds sodium in its formula.Potassium feldspar comes in three different crystal structures that depend on the temperature it formed at.Microcline is the stable form below about 400 c.Orthoclase and sanidine are stable above 500 c and 900 c, respectively.