Ivory: A :Legend of Past and Future

The ivory of the animal known only as the Kilimanjaro Elephant is the object of a galaxy wide search by Duncan Rojas, a researcher, and Bukoba Mandaka, the last Maasai. The epic novel covers all the lives the ivory touches and alters over the next six millennia as Rojas and Mandaka search for it across both the eons and the galaxy, and the purpose of that search is finally unveiled.
Ivory: A Legend of Past and Future was a Nebula nominee for Best Novel in the United States, and a Clarke nominee for Best Novel in England.