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Weight: 206 grams
The fluorescence under UV light is due to trace amounts of uranium in the quartz
Weight: 171
Weight: 2175 grams
Weight: 2925 grams
75g Optical Calcite Freeform TC2112 brazil Weight: 206 grams75g Optical Calcite Freeform Approx. Dimensions: 1. 5x0. 75x2. 25 inches Approx. Weight: 75 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
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