Moonstone is a trade name for a popular decorative stone that often exhibits a blue flash.
This optical characteristic is known as adularescence. Stones can also exhibit a silky or pearlescent lustre.
A considerable amount of moonstone being sold is white labradorite.
Moonstone can be found in several colours including pink, cream, white and black.
It has a long history and is steeped in mythology and folklore. It's always been associated with the moon.