Optical calcite, also known as Iceland Spar, is an amazing metaphysical stone that helps to stimulate and open the third eye and crown chakras. It is believed to be a powerful stone for healing, spiritual growth and inner transformation. It can help to amplify thoughts and energy, and can assist in seeing beyond illusions and distortion. It can also help to bring clarity and understanding of situations, and can be used to enhance clear communication. It is believed to help with spiritual development, psychic abilities, and healing on a mental and emotional level.