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Weight: 826
characterized by its coloration derived from traces of manganese
Weight: 483 grams
formed by the impact of a meteorite or comet in southern Germany about 15 million years ago
86g Optical Calcite Freeform TC2101 sphalerite Weight: 82686g 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
US$ 70.00
US$ 29.95
US$ 237.50
