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CALCITE - DOUBLE REFRACTION<br />
Iceland spar variety<br />
Also known as Optical Calcite, it displays Calcite's classic cleavage form - the rhombohedron, and is the most stable polymorph of calcium carbonate (CaCO3) Double refraction occurs when a ray of light enters the crystal and due to calcite's unique optical properties, the ray is split into fast and slow beams. As these two beams exit the crystal they are bent into two different angles because the angle is affected by the speed of the beams. A person viewing into the crystal will see two images.

Fphoto-19499007-1PS.jpg

CALCITE - DOUBLE REFRACTION
Iceland spar variety
Also known as Optical Calcite, it displays Calcite's classic cleavage form - the rhombohedron, and is the most stable polymorph of calcium carbonate (CaCO3) Double refraction occurs when a ray of light enters the crystal and due to calcite's unique optical properties, the ray is split into fast and slow beams. As these two beams exit the crystal they are bent into two different angles because the angle is affected by the speed of...
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Copyright:© 1990 Paul Silverman - Fundamental Photographs

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