Sardonyx
Sardonyx Sardonyx (Photo by Arpingstone) (Wikimedia) Minerological name: Chalcedony type Parts used: Sardonyx as we know it today is red and white banded Agate. However, the term traditionally included a number of other Chalcedony varieties: Pliny described it as having a white opaque layer upon a red transparent layer of true Sard. This was the…

