Optical Calcite Freeform TC2017 large skull German Yellow Fluorite Specimen on

German Yellow Fluorite Specimen on Acrylic Base

causes a lovely play of light

Nydegger Plume Agate is definitely one to add to your collection

smaller colorless fluorite cubes cluster around

357g Optical Calcite Freeform

Optical Calcite Freeform TC2017 large skull German Yellow Fluorite Specimen onOptical Calcite Freeform Approx. Dimensions: 2. 5 x 1. 75 x 3 inches Approx. Weight: 420 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