5.65" Polished Moss Agate Nodule Half - South Dakota

This is a beautiful 5.65" nodule half of moss agate collected from South Dakota. It may also be known as Badlands chalcedony, but we have not found any evidence of that trade name. However, its polished interior reveals an intricate array of mosslike accumulations, radiating in feathery shapes from the center of the nodule. Though its origins are a bit of a mystery, this agate nodule is no less gorgeous for it. It 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
South Dakota
5.65 x 5.15", up to 1.85" thick