Rainbow Moonstone, also known as White Labradorite, is actually a variety of Labradorite that exhibits flashy colors and rainbows throughout. Because this stone is so similar to Moonstone, it has been accepted as one and known as the trade name, though it still remains a form of Labradorite. Rainbow Moonstone is a closely related feldspar mineral with sheen in a variety of iridescent colors that displays a pearly and opalescent schiller. Generally a creamy translucent white stone, Rainbow Moonstone features colorful blue flashes with transparency that range from opaque to semi-translucent. Rainbow Moonstone is best seen in natural light for play of color. Moonstone has been used in jewelry by ancient civilizations. In more recent history, moonstone became the hallmark of the Art Nouveau period. Rainbow Moonstone deposits can be found in Australia, Madagascar, Mexico, India, Poland and Sri Lanka.