Potassium feldspar

• Orthoclase, an important tectosilicate mineral that forms igneous rock
• Microcline, chemically the same as orthoclase, but with a different crystalline structure
• Sanidine, the high-temperature form of potassium feldspar ₄O₈
• Adularia, a more ordered low-temperature variety of orthoclase or partially disordered microcline
• Amazonite, a green variety of microcline