Mitchell signed a document when he sold the Bible in 2000 certifying that there were only 12 surviving copies to the best of his knowledge.
"Many of these men were very spiritual," Livingston said. "Buzz Aldrin celebrated communion in the Lunar Module. Mitchell was interested in ESP."
Other items in the auction, which ends Sept. 22, include a glove worn by Neil Armstrong while training for his moonwalk and a page from the Apollo 11 flight plan signed by Buzz Aldrin.