3" Colorful, Polished Banded Dryhead Agate - Montana

This is a tightly-banded, 3" wide Dryhead agate from Big Horn County, Montana. These agates are prized for their distinct banding that ranges from yellow, to orange, red and pink. The center of the agate often features quartz crystals that are nicely corralled by the banding. One face of the agate is polished to a glossy finish.

It 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
Dryhead Agate Mine, Bighorn River area, Pryor Mountains, Big Horn Co., Montana, USA
3 x 2.6", up to .7" thick