4.3" Polished Pilbara Agate Slab - Worlds Oldest Agates

This is a slab of banded agate from a location near Nullagine in Western Australia. These agates are found in the Maddina Basalt and studies have shown that these are probably the oldest agates in the world, with an age in excess of 2 billion years. This colorful slab has been polished to a mirror-like finish on one side and comes with a 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
Nullagine, Pilbara region, Western Australia
4.3 x 3.1", .5" thick