64g Optical Calcite Freeform TC2139 byssolite 5 to 4 on the

5 to 4 on the Mohs scale and typically exhibits a vitreous to pearly luster

Dimensions: 5x2x0

The Tyndall effect is also the reason why blue chalcedony appears yellow or brown when strong light shines through it

Dendritic opal pendant set in sterling silver

64g Optical Calcite Freeform TC2139 byssolite 5 to 4 on the64g Optical Calcite Freeform Approx. Dimensions: 1. 25x1x2. 25 inches Approx. Weight: 64 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