Moon mineralogy mapper, which is also known as M3 was one of the most successful payloads from Chandrayaan-1. M3 from the Brown University and JPL was an imaging spectrometer designed to map the surface mineral composition. It confirmed the traces of water vapour, which was a significant contribution of the Chandrayaan-1 mission.
M3 provided the first high-resolution spatial and spectral map of the entire lunar surface, which helped in understanding the elemental composition of the Moon. M3 was used to map almost over 95% of the lunar surface in its low-resolution called Global mode, while some region was studied in the high-resolution Target mode.
From the spectral analysis of M3, it is also believed that Hydroxyl ions and water molecules formation is on-going process on Moon. The confirmation about water vapour from M3 made Chandrayaan-1 a vital mission in the history of space science.