Iceland spar is a type of transparent calcite or crystalized calcium carbonate, also known as Calcspar, Clear Calcite, Iceland crystal, Optical Calcite or Sunstone. It was originally brought from Iceland to demonstrate the polarization of light and is important in understand how light works as a wave. It is also believed to be the sunstone crystal the Vikings used to navigate in cloudy weather. Iceland Spar is said to be a cleansing crystal and helps energy flow through the body to help with mental expansion. It helps with large life changes and learning new things. Iceland Spar helps increase intuition, wisdom and spirituality.