INDIAN mine catlinite in Barron County in Wisconsin; and here in Minnesota Native Americans already in pre-Columbian times this systematically quarried stone red pipe; with whom did their large Calumets; ceremonial pipes. Just this stone extracted from the earth clay was so soft that you could mold with a knife; but exposure to air made her become very tough. Reconstruction located on the Milwaukee Art Museum. Chromos; Wisconsin; circa 1925.