69g Optical Calcite Freeform TC2127 azurite Inclusions of Byssolite give the

Inclusions of Byssolite give the specimen a grayish-blue color in sections

is a very vesicular volcanic (igneous) rock that is typically dark colored

Weight: 112 grams

and is made up of a continuous framework of silicate (SiO4) tetrahedra

terminated specimen

69g Optical Calcite Freeform TC2127 azurite Inclusions of Byssolite give the69g Optical Calcite Freeform Approx. Dimensions: 1x1x1. 5 inches Approx. Weight: 69 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