Excerpt - page 47: "... one of them as a small stone, not exactly black, but was rather a dark color. In 1841 Joseph showed his other, whitish stone to the Council of the Twelve in Nauvoo and told them, Brigham Young ..."
Conservation of Historic Stone Buildings and Monuments
by Committee on Conservation of Historic Stone Buildings and Monuments, National Materials Advisory Board, and National Research Council
(Loose Leaf - Jan 1, 1982) - Photocopy