The moonstone’s shifting luminescence and haunting blue-white colour, has meant that it’s been likened to the moon for thousands of years. Throughout history, the stone has had an association with the moon goddess and the night sky.
Adularescence is the term given to describe the moonstones iridescent sheen. It’s caused by the intergrowth of two types of feldspar, which have different refractive indexes. The light reflected from these layers produces the blue luminescence that makes the moonstone so special.