This is natural Chalcedony that has been cut from a larger piece, with several smoothed sides and untouched "druzy" sides. Druzy refers to the fine small crystallization on the surface.
Approximately 4.8 x 2.7 x 12.6 inches (width x depth x height)
8.3 pounds weight
Gray Chalcedony is know as a stone of stability, balance, and harmony.