Rainbow moonstone is transparent labradorite, a closely related feldspar mineral with sheen in a variety of iridescent colors. Although it's technically not moonstone, it's similar enough that the trade has accepted it as a gem in its own right. Today some people prefer it to traditional moonstone. Moonstone is a variety of the feldspar-group mineral orthoclase. During formation, orthoclase and albite separate into alternating layers. When light falls between these thin layers it is scattered producing the phenomenon called adularescence. In Vedic Astrology, It is worn for Moon. It soothes emotional instability and stress, and stabilizes the emotions, providing calmness. Group: Labradorite Refractive index: 1.559-1.568 Birefringence: 0.009 Specific gravity: 2.70/ ±0.05 Crystal system: Triclinic Hardness: 6-6.50 Inclusions: Labradorescence, Aventurescence, Asterism Origin: Australia, Madagascar, Sri Lanka, India and Mexico Note: Images shown are sample, you will receive the same quality