What is the state rock of Montana?

The state rock of Montana is the agate. Agate is a form of chalcedony, a mineral that is characterized by its banded colors and striking patterns. The agate is commonly found in Montana’s riverbeds, prairies, and hills, where it is prized by rock hunters for its beauty and uniqueness. Montana’s agates come in a wide variety of colors, from translucent reds and yellows to vibrant greens and blues. The agate was designated as the state rock in 1965 due to its abundance in the state and its significance to Montana’s natural landscape and heritage.