7.8" Polished, Banded Agate Slab - Brazil

This is a richly colored piece of banded agate that has been cut flat and polished on both sides. This specimen was collected from southern Brazil and features a variety of colors of agate including orange, yellow and red. It comes with an acrylic display stand.

Note: It is likely this slab has been heat treated due to how dark the colors are.

Agate is a variety of microcrystalline quartz (chalcedony) that displays translucence and, in some cases, banding. Agate primarily forms when silica-rich fluids fill pockets within rocks and/or fossils, depositing the silica along the walls of the rock. This process can result in banding patterns, as the compositions and impurities of these depositing fluids change over time. These banding patterns can either form as flat layers, creating linear patterns known as waterline agate, or as rounded layers, forming more common ring-like patterns. These patterns depend on the surfaces available for deposition.
Chalcedony var. Agate
Soledade, Rio Grande do Sul, Brazil
7.8 x 6.7", .2" thick