Moonstone is typically a potassium aluminium silicate, with the chemical formula KAlSi3O8 The most common moonstone is of the mineral Adularia. The Plagioclase Feldspar Oligoclase also produces moonstone specimens. The sheen is caused by light reflecting internally in the moonstone from layer inclusions of different Feldspars.
Rainbow moonstone has a gentle, calming energy. It helps to strengthen intuition and psychic perception, and enhances creativity, compassion, endurance and inner confidence. It is a stone that brings balance and harmony. The Rainbow effect brings in a spectrum of light, and can help with clearing and bringing in uplifting energies. It has been said to have the power to grant wishes.