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Optical Calcite or Iceland spar, formerly known as Iceland crystal, is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light. It occurs in large readily cleavable crystals, easily divisible into rhombs, and is remarkable for its double refraction.

Historically, the phenomena of this crystal were studied at length by Christiaan Huygens and Isaac Newton. Sir George Stokes also studied the phenomenon.

Optical Calcite works to clear and activate all of the chakras, improving the flow of energy throughout the subtle bodies. Meditation with Optical Calcite can help to improve one's perception of the physical world and of the self, creating a shift in those who experience predominantly negative emotions.