357g Optical Calcite Freeform TC2009 ruby zoisite Siberia remains the primary source

Siberia remains the primary source of this unique mineral

The top has been polished on its faces but the sides are all natural with very nice striations and etchings

Weight: 142 grams

Weight: 541 grams

The structures were empty tubes

357g Optical Calcite Freeform TC2009 ruby zoisite Siberia remains the primary source357g Optical Calcite Freeform Approx. Dimensions: 2. 5x2x2. 5 inches Approx. Weight: 357 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