The methods of deriving FeO and TiO2 contents from the Clementine spacecraft data were discussed, and an approach was developed to derive the content from the measurements using the Moon Mineralogy Mapper (M3) instrument on Chandrayaan-1. The density of lunar bedrock was then modeled on the basis of the derived FeO and TiO2 abundances. The FeO and TiO2 abundances derived from the M3 data were compared with the previous results of the Clementine data and were in good agreement. The FeO abundance data also agreed well with the Lunar Prospector data, which were used as an independent source. The previous Clementine and newly M3 derived abundances were compared with the laboratory measured FeO and TiO2 contents in the Apollo and Luna returned samples. The Clementine derived FeO content was systematically 1%–2% lower than the laboratory measurements in all the returned samples. The M3 derived content agreed well with the returned Apollo samples and was within ±2.8% of the laboratory measurements. The Clementine derived TiO2 abundance was systematically 0.1%–4% higher than the laboratory measurements of the returned samples. The M3 derived TiO2 agreed well (±0.6%) with the laboratory measurements of the returned samples, except for samples with high TiO2 content. However, these results should be carefully interpreted because the error range requires verification. No error analysis was provided with the previous Clementine derived contents.