What is the state rock of South Dakota?

The state rock of South Dakota is the Fairburn agate. This gemstone is known for its striking banded patterns and vibrant colors, including reds, oranges, and browns. Fairburn agates are primarily found in the western part of South Dakota, particularly in the region around the Black Hills. The agate has been a popular specimen for collectors due to its unique appearance and rarity. It was designated as South Dakota’s state rock in 1966, symbolizing the state’s geological richness and the beauty of its natural landscape.