Image derived from the Clementine global color data (in 415-nanometer and 750-nanometer wavelengths) showing the concentration of titanium in the soils of the lunar surface. The highlands are very low in titanium, while the maria display many units of widely varying titanium content. Most of the very high titanium mare basalts (first discovered in the samples returned by Apollo 11) are found in Mare Tranquillitatis and parts of Oceanus Procellarum. See Blewett et al. (1997) for details on this method of titanium mapping.
Image processing by ACT Corporation, Alexandria, Virginia; Lunar and Planetary Institute, Houston, Texas; and University of Hawai’i, Honolulu, Hawai’i.