64g Optical Calcite Freeform TC2139 byssolite making it durable and suitable

making it durable and suitable for various jewelry applications

Dendritic opal pendant set in sterling silver

purple (amethyst)

Some of the sphalerite crystals are small enough that they are able to show their semi-transparent orange color

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

64g Optical Calcite Freeform TC2139 byssolite making it durable and suitable64g 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