3.5" Polished Agate Nodule Slab - TeePee Canyon, South Dakota

This is a cut and polished agate nodule collected from TeePee Canyon in South Dakota. This slab features bands of pink and red agate and 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 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
TeePee Canyon, South Dakota
3.5 x 3.3", up to .49" thick