Mexico, Chihuahua: This is a large nodule that I was lucky enough to cut and find an amethyst core. The amethyst is ringed by banded chalcedony (agate) which feature parallax (shadow) banding. Just a unique and beautiful specimen that polished up nicely on the vibra lap. Total weight is 4lbs and each half measures over 4” in every direction. This item qualifies for free shipping.