77g Optical Calcite Freeform TC2103 blue lace agate 8" Double Terminated Colombian Lemurian

8" Double Terminated Colombian Lemurian

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77g Optical Calcite Freeform TC2103 blue lace agate 8" Double Terminated Colombian Lemurian77g Optical Calcite Freeform Approx. Dimensions: 1x1x2 inches Approx. Weight: 77 grams Locality: Maharashtra, India Optical calcite is also referred to as Iceland Spar because of its first discovery in Eskifjord, Iceland. It is typically colorless, and exhibits the optical phenomenon of double refraction where an object viewed through the calcite will appear doubled. Double refraction, or birefraction, is also called birefringence and is also