3.6" Polished Agate Replaced Barite Nodule Pair - Utah

This is an interesting nodule of barite crystals that have been replaced by agate, creating this stunning mineral specimen. This material was collected in Moab, Utah and has been cut in half and polished to a glossy finish. Both sides of the nodule are included, along with a pair of display stands.

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
Moab, Utah
Entire nodule: 3.6 x 3.6 x 2.8"