75g Optical Calcite Freeform TC2112 sulfur particularly during the late 19th

particularly during the late 19th and early 20th centuries

usually fracturing into rhombohedral shapes

Dimensions: 4 x 3 x 2 inches

Ammonite Ring Size 8

75g Optical Calcite Freeform TC2112 sulfur particularly during the late 19th75g 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