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Green Aventurine Skull Carving
Northern Siberia
Green Aragonite Slab
Hyalite doesn't have the same internal structure of tiny spheres of silicon dioxide that cause precious opals to have brilliant displays of color
Optical Calcite Freeform TC2017 septarian cube Green Aventurine Skull CarvingOptical Calcite Freeform Approx. Dimensions: 2. 5 x 1. 75 x 3 inches Approx. Weight: 420 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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