“Now the first that my <husband> [Joseph Smith, Jr.] translated [the Book of Mormon], was translated  by the use of the Urim, and Thummim, and that was the part that Martin Harris lost, after that he used a small stone, not exactly, black, but was rather a dark color.”

Emma Smith Bidamon to Emma S. Pilgrim – 27 March 1870, Letter. See Dan Vogel, Early Mormon Documents – Volume One (Salt Lake City, UT: Signature Books, 1996), 532.