4.3" Polished Baker Ranch Thunderegg - New Mexico

This is a gorgeous "Baker Ranch Thunderegg" that was collected from New Mexico. It has been cut in half and polished, and features multiple agate and quartz filled pockets. Both halves are included with your purchase, each of which is accompanied by an acrylic display stand

Baker Ranch was the old name given to the general area that these thundereggs were collected, though there are several thunderegg collection sites within "Baker Ranch". One of the better known mines of this area is The Baker Egg Mine which produces a variety of colorful thundereggs. The site that this thunderegg was collected from is no longer accessible.

Baker Egg agate (also known as Baker Ranch agate) is a type of agate that formed as thundereggs (Lithophysae) from a primarily rhyolite-perlite host rock. They are collected from an area southwest of Deming, New Mexico that was formerly known as Baker Ranch. These thundereggs are unique in that they exhibit vibrant coloration that is typically only found in agate nodules (amygdaloids). Thundereggs are rarely found in any other color than white, blue or grey-blue, yet Baker Egg Mine produces mixtures of red, yellow, black, white and in rare cases, green agate. This is due to the unique geologic history of the area where rhyolitic lava deposits (thunderegg producing) over millions of years, were disrupted by a mixture of geologic forces and the introduction of basaltic and andesitic lava flows. These additional lava flows are believed to have provided the minerals necessary for the variety of coloration found in Baker Egg agates (thundereggs).

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.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.
Chalcedony var. Agate & Quartz
Southwest of Deming, New Mexico
4.3 x 3.5" (each half)