An oath taken on sacred stones was regarded by the ancient Scandinavians as peculiarly binding upon him who took such an oath; in the old Norse annals it is stated that Gudrun Gjukesdatter offered King Atle that he would take an oath on the “pure white stone.” The hero Duthmaruno is said to have sworn by “Loda’s Stone of Power,” which represented the almighty divinity of the Norsemen.[56] A sacred well on the north side of Lough Neagh, Ireland, lends peculiar sanctity to the yellow crystals found in great quantity near by. The belief in their miraculous quality finds expression in the legend that they grow up out of the ground on Midsummer Night, and whosoever wishes to possess them as talismans must pronounce certain magic rhymes in the act of collecting them. They then become luck-bringers of potent virtue and ensure the prosperity of the household in which they are guarded.[57] The stone, or rather rock, named catlinite, and popularly known as “pipe-stone,” was regarded by certain tribes as one of their most valuable materials,[58] and was extensively used for pipe-bowls. In color it ranges from a deep red to an ashy tint; the chief quarry is situated some three hundred miles west of the Falls of St. Anthony, on the dividing ridge between the Saint Peter’s and Missouri rivers. This region was visited in 1836 by George Catlin, to whom we are indebted for the preservation of so much regarding Indian folk-lore and customs, and after whom the substance is named. While it is impossible to determine with any degree of certainty for how long a time the Indians were familiar with this material, there are those who believe that the quarries were worked and the material used for pipe-bowls by native sculptors long before the earliest notice we have to that effect.[59] Great skill and patience were displayed by the Indians in the making of these pipe-bowls, which were sometimes carved with various symbolical figures. We have an early record of such pipes from the pen of Jacques Marquette, a Jesuit missionary to the Indians, who saw one when visiting the Illinois Indians in 1673. He reports it as being of polished red stone, like marble, so pierced that one orifice served to hold the tobacco, while the other was fastened on the stem, which was a stick two feet long, as thick as a common cane and pierced in the middle. The whole was covered with large feathers of red, green, and other colors.