Brazilian Piranha Agate Polished Stone Slab

This lovely stone slab of Piranha Agate from Brazil is polished on one side and it is 4.8 inches by 2.5 inches and 6 mm thick.

Piranha Agate comes from the State of Parana, near Guarapuava, Brazil and appears to be closely related to what is generally called Brazilian Agate. The name is believed to be a misspelling of its location.

No gemstone is more creatively striped by nature than agate, chalcedony quartz that forms in concentric layers in a wide variety of colors and textures. Each individual agate forms by filling a cavity in host rock. As a result, agate often is found as a round nodule, with concentric bands like the rings of a tree trunk.

The bands sometimes look like eyes, sometimes fanciful scallops, or even a landscape with dendrite trees.