2.0" Polished, Banded Bahia Agate Nodule Pair - Brazil

This is a richly colored nodule of banded Bahia agate that has been cut in half and polished to a glossy finish on one side of each half. This specimen was collected from the State of Bahia, Brazil and features a variety of bands of cream, orange, and pink. The nodule's exterior surfaces are also polished.

Each half is accompanied by 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
São Francisco River, Bahia, Brazil
Entire nodule: 2.0 x 1.6 x 1.25"