4.2" Polished, Banded Agate Slab - Brazil
This is a richly colored piece of banded agate that has been cut flat on both sides and polished on one. This specimen was collected from Brazil and features a variety of colors of agate including orange, yellow and red agate. Comes with an acrylic display stand.
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 rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.