86g Optical Calcite Freeform TC2101 calcite Grape agate is a purple

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

Pyrite Obelisk

Moss Agate Sphere

Weight: 37 grams

Dimensions: 4x1x0

86g Optical Calcite Freeform TC2101 calcite Grape agate is a purple86g 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