Lunar meteorites collected in Africa and Oman are, for all practical purposes, the only source of moon rocks available for private ownership. This is because all rocks collected during the Apollo moon-landing program are property of the United States Government, or other nations to which the U.S. conveyed them as gifts. Similarly, all lunar meteorites collected by the U.S. and Japanese Antarctic programs are, by treaty, held by those governments for research and education purposes only. Although there is no U.S. law specifically against the ownership of Apollo moonrocks, none has ever been (or is likely to ever be) given or sold by the U.S. government to private citizens. Even in the cases of plaques containing genuine Apollo moonrocks given in 2004 to astronauts and Walter Cronkite, NASA retained ownership of the rocks themselves[7]. Most of the moonrocks collected by the Luna 16 probe are also unavailable for private ownership, although three tiny samples were sold at auction for $442,500 in 1993[8].