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 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.
Chalcedony var. Agate
Ochs Ranch, Madras, Oregon
3.8 x 3.1"