Calcite Schist from Grenville, Quebec, Canada. Comes with certificate of authenticity. Stone type: Calcite Schist. Dominant color: multicolored. Origin: Canada. Average weight (Carats): 26.7 carats. Dimensions (mm): 31 x 13 x 10 mm. Ref. : SKU030676. Metamorphic schist rich in calcite, formed by the transformation of carbonate rocks. Used for ornamental objects.