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formed by the impact of a meteorite or comet in southern Germany about 15 million years ago
characterized by its coloration derived from traces of manganese
Weight (carving only): 2
Weight: 483 grams
Dimensions: 3x1x0
86g Optical Calcite Freeform TC2101 sphalerite formed by the impact of86g Optical Calcite Freeform Approx. Dimensions: 1. 25x1x2 inches Approx. Weight: 86 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
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