357g Optical Calcite Freeform TC2009 bob ross Silver Sheen Obsidian Medusa

Silver Sheen Obsidian Medusa

Weight: 84 grams

Trapped gasses formed cavities within the rhyolite

2" Charoite Sphere

357g Optical Calcite Freeform TC2009 bob ross Silver Sheen Obsidian Medusa357g Optical Calcite Freeform Approx. Dimensions: 2. 5x2x2. 5 inches Approx. Weight: 357 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