An oval shaped semiprecious stone brown fossil Turritella Agate designer cabochon that is 48 mm long by 27 mm wide and 6 mm thick.
Turritella Agate is actually seashell that has been agatized or replaced by silica.
This fossil gemstone material comes from the Green River Formation in Wyoming.
Turritella Agate is from the Miocene Epoch and is about 24 million years old.
Turritella fossil cabochons are about a 7 hardness, wear well and take a good polish.