Optical Calcite, is a variety of Calcite that is double refractive, meaning objects appearing through it will look as though they’re in two places at once. The index of refraction of the crystal is different for light of different polarization. A ray of unpolarized light passing through the crystal divides into two rays of perpendicular polarization directed at different angles, called double refraction. Optical Calcite typically appears colorless or white, sometimes containing rainbow inclusions inside from the light refraction. While it was first discovered in Iceland, it has since been found in regions of Mexico as well.
This item is 2.75" x 1.75" and weighs 8.1 oz.
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