Three different varieties of felspar are cut and polished as moonstone. It is a milky, milky white gem which shows a delicate pearly opalescence. Adularia moonstone which has a bluish sheen is most highly prized.
Moonstone is so named because it was believed that a small white spot appeared in the stone at the new moon and moved to the centre and became larger as the moon became full.
Moonstone was thought to give good luck to lovers and to arouse passion. If lovers place moonstone in their mouth when the moon is full they were believed to get the ability to foretell the future.