3.9" Polished Yellowstone River Agate Section - Montana

This is a beautiful 3.9" wide, polished Yellowstone River Agate nodule half that was collected along the Yellowstone River in Montana. It features faint banding and dendritic formations throughout the jasper.

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
Yellowstone River, Montana
3.9 x 3.3"