7.1" Polished Banded Agate - Morocco
This is a gorgeous polished agate nodule half that was collected from Aouli, Morocco. One side of this specimen has been cut flat and polished to a glossy finish, while the other side and outer edge have been left rough. There are stick-like formations through the agate (stick agate), likely a result of aragonite formation. 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.