Clear Calcite is also known as Iceland Spar. It is a calcium carbonate mineral, has a rhombohedral crystal system and a hardness of 3.
Clear Calcite acts in the same way as clear quartz, it can be programmed to amplify intent, helping to bring said intent in to the physical world. It is also said to be a good stone for those in need of an "attitude adjustment" by helping one to clearly see the root of a problem that may be causing one to be angry, arrogant or resentful. The double-refractive nature of clear Calcite is believed to aid in reaching multi-level awareness during meditations.