Blue moonstone, with its transparent opalescence, is far rarer than the milky white variety, though both are a type of feldspar. Our blue moonstone comes primarily from Sri Lanka, where they are faceted. Metaphysically the blue moonstone has been used to help gain clarity of vision through heightened receptivity. Moonstones are also associated with good luck by many vendors who sell them in the East.
This photo above is a mixture of blue moonstone and white moonstone.