Moonstone is a type of feldspar mineral with a unique sheen resembling the glow of the moon, hence its name. It is typically translucent to opaque with a milky or pearly appearance, and it often exhibits a phenomenon called adularescence, where a bluish or whitish light seems to float just beneath the surface of the stone, moving as the stone is turned. This effect is caused by light scattering between microscopic layers of feldspar within the stone.

Moonstone has been prized for centuries for its mystical and ethereal qualities, and it has been used in jewelry and adornments in various cultures around the world. In addition to its aesthetic appeal, moonstone is also believed to possess metaphysical properties such as promoting intuition, inspiration, and emotional balance.

Moonstone is found in various locations around the world, including India, Sri Lanka, Madagascar, Australia, and the United States.