Moonstone has an ethereal look and is the official birthstone of June. Pearl can also be used as the birthstone for June.
The ethereal glow of Moonstone is caused by light scattering between microscopic layers of feldspar. This phenomenon is known as adularescence. Most commonly Moonstone is blue-white or peach in color but other colors are also known. A prized type is when it has a "cat's eye" effect.
The mystical look of Moonstone has created many myths. Ancient peoples believed that it had mystical powers or could aid in spiritual awareness. Some even believed that if you wore it you might be able to become invisible or transcend the planes of existence.
Mineral Group: Feldspar
Colors: Colorless to White, Gray, Green, Peach, Brown
Refractive Index: 1.518 to 1.526
Birefringence: 0.05 to 0.008
Specific Gravity: 2.58
Mohs Hardness: 6.0-6.5