Moonstone owes its name to the striking play of light on its surface which changes when the stone is moved. One synonym for moonstone is "adularia" after the feldspar group found in the European Alps near the Adula group.. Another is "Selenite" after the Greek moon Goddess Selene. Moonstone can be colorless, white, yellow, green, brown, orange, pink, or grey, but it always has a white or blue sheen. A gorgeous addition to your gemstone collection.