Tumbled polished South Dakota Prairie Agate

Prairie agate is a type of agate found in the Great Plains region of North America. It is known for its beautiful banding and colors, which are typically shades of brown, red, and white.

Prairie agate forms when silica-rich water seeps into cavities in volcanic rock. Over time, the silica precipitates out of the water and forms layers of agate. The banding in the agate is caused by variations in the mineral content of the water.

Tumbled prairie agate is a type of agate that has been polished to a smooth, rounded finish. It is often used in jewelry and other decorative items.