607g Optical Calcite Freeform TC1977 prehnite 5 x 9 inches (with

5 x 9 inches (with stand)

Aventurine is a form of Quartz that exhibits plates and flakes of inclusions that give the mineral its sparkle

Faceted smokey quartz ring set in sterling silver

Great glassy luster on this vibrant yellow fluorite from Moscona Mine in Spain

607g Optical Calcite Freeform TC1977 prehnite 5 x 9 inches (with607g Optical Calcite Freeform Approx. Dimensions: 3x2. 5x2. 75 inches Approx. Weight: 607 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