75g Optical Calcite Freeform TC2112 brazil Rainbow Obsidian is another form

Rainbow Obsidian is another form of Sheen Obsidian that gets its iridescent sheen from inclusions of magnetite nanoparticles

Dimensions: 4x3

Weight: 206 grams

Weight: 2925 grams

Weight: 171

75g Optical Calcite Freeform TC2112 brazil Rainbow Obsidian is another form75g 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