William Smith provides a late (1905) description of Joseph's "peeping stone."
William Smith, "As to Joe Smith," The Montrose Democrat (June 29, 1905): 5
As a boy, he remembers of seeing Joseph Smith, who afterwards became head of the sect known as the Mormons, who founded Salt Lake City in Utah...He remembers of seeing the "peeping stone" which Joe put in his hat and pretended to discover money by so doing. The stone was similar to the speckled stones which are still to be found along the river shore.