Catlinite
Catlinite, also known as pipestone, is a type of red-brown, soft, fine-grained argillite that is primarily used for carving pipes and other ceremonial objects by Indigenous peoples of North America, particularly those of the Plains. It is found in limited deposits, most famously at Pipestone National Monument in Minnesota. The material is prized for its ease of carving and its symbolic significance.
The term "catlinite" was coined by George Catlin, an American artist and advocate for Native American culture,
The quarrying of catlinite is a culturally significant practice. Access to the quarries is typically restricted