Unusual materials include native copper (Michigan), pipestone (Minnesota), petrified wood (Arizona), and jadeite (Alaska). Sacred pipestone comes from Pipestone, Minnesota. Today only Native Americans are allowed to quarry the pipestone from this quarry. Lewis and Clark noted the pipestone quarry in their journals in 1805. The pipestone from this quarry is considered the softest stone available. Today only people of Native American ancestry are allowed to quarry the pipestone. There is also an orientation video about the history of the pipestone quarries. The pipestones are from deposits of red pipestone used by Native Americans to make pipes. It is weaker and more subject to breaking under stress than Utah pipestone. Patrick spent most of his time in boarding schools in Red Lake and Pipestone, Minnesota. Roberts was born in Pipestone, Manitoba. Pipestone is part of the Rural Municipality of Pipestone. Canby, Granite Falls, Jackson, Pipestone, and Worthington. One manufacturing plant was in Pipestone, Minnesota.