Having the same chemical formula as microcline, it is differentiated from that mineral due to its monoclinic crystal system.
Some varieties of it, such as perthite or cryptoperthite, are intergrown with albite which is exsolved from pegmatites, granodiorites, or granites. It follows only the Carlsbad, Manebach, and Baveno Laws of twinning, (*) and as temperatures rise, sanidine is more likely to be formed than it. Having the same chemical formula as microcline, it is differentiated from that mineral due to its monoclinic crystal system. Consisting of potassium aluminum silicate, it is formed at medium temperatures after the continuous and discontinuous branches of Bowens reaction series merge. FTP, name this variety of feldspar with shardness 6, the counterpart of plagioclase.
Some varieties of it, such as perthite or cryptoperthite, are intergrown with albite which is exsolved from pegmatites, granodiorites, or granites.
{orthoclase} feldspar