This Specimen has been sold.
5.3" Polished Seam Agate - Lucas Creek, Washington
This is a 5.3" wide, polished seam agate section from Lucas Creek in Washington State. This section features yellow, white and red agate that formed within the seam of a rock. It has been cut flat and polished on one face.
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.