Moonstone has a monoclinic crystal system and is a potassium feldspar. This means that its inner structure is in the shape of a parallelogram. Its inner laminate structure bends light and when the stone is cut and polished, this leads to its sometimes white to bluish, shimmering light.
Moonstone, as its name indicates, has been assigned to the moon and is traditionally considered to be a stone associated with intuition, feelings, the heart and fertility. A soul stone.