86g Optical Calcite Freeform TC2101 calcite Moss Agate Sphere

Moss Agate Sphere

Pyrite Obelisk

Grape agate is a purple form of botryoidal chalcedony found in Indonesia

The structures were empty tubes

86g Optical Calcite Freeform TC2101 calcite Moss Agate Sphere86g Optical Calcite Freeform Approx. Dimensions: 1. 25x1x2 inches Approx. Weight: 86 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