Moonstone is a potassium aluminum silicate mineral. It has a monoclinic crystal system and a hardness of 6 - 6.5.
Moonstone is a stone of new beginnings and as it's name suggests, is strongly connected to the moon and to intuition. It is a sacred stone that is said to stimulate inner reflection and self discovery, promote empathy, and enhance psychic abilities. It is believed to open one's mind to sudden and irrational impulses, serendipity and synchronicity. Green Moonstone is also known as Garnierite.