3.8" Polished Moss Agate - Oregon

This is a 3.8" wide moss agate "thunderegg" geode half, collected from the Ochs Ranch in Madras, Oregon. The interior contains flowing moss-like inclusions that are surrounded by colorless agate. It was found as a thunderegg, though the surrounding rock has been mostly prepped away.

This specimen 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 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
Ochs Ranch, Madras, Oregon
3.8 x 3.1"