86g Optical Calcite Freeform TC2101 sphalerite Weight (carving only): 2

Weight (carving only): 2

Weight: 483 grams

formed by the impact of a meteorite or comet in southern Germany about 15 million years ago

Weight: 826

Dimensions: 3x1x0

86g Optical Calcite Freeform TC2101 sphalerite Weight (carving only): 286g 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