TL;DR: Ilmenite is a main entry in the 外星矿物知识引擎 database.
Ilmenite is the most important mineral for near-term lunar ISRU. Hydrogen reduction at 900-1100°C produces water (then electrolyzed to O₂ and H₂) and metallic iron. Titanium byproduct is valuable for aerospace applications. Lunar mare regions contain 5-20% ilmenite.
Crystal System
Trigonal (rhombohedral)
Occurrence
Abundant in lunar mare basalts (up to 20% by volume); found in achondrite meteorites
Significance
Primary source of titanium, iron, and oxygen via hydrogen reduction; most studied lunar ISRU feedstock
Source
Apollo sample analysis, Luna sample analysis