Nothing off-world is chemically foreign. Every deposit we survey maps onto elements already catalogued on Earth, only concentrated, preserved, or exposed by processes this planet erased. This table traces those correspondences and what each unlocks.
XR-01Mare basalt fines, 45% SiO₂ by mass
Lunar regolith (KREEP)
↔Silicon, Aluminum, TitaniumIlmenite (FeTiO₃) in mare soils is the same mineral mined in Australian beach sands. Hydrogen reduction yields oxygen and metallic iron, the identical chemistry used in terrestrial steel pre-reduction.
EnablesStructures, solar cells, breathable O₂
XR-02Implanted in the top microns of lunar soil
Solar-wind volatiles
↔Helium-3, Hydrogen, Nitrogen, CarbonHelium-3 is effectively absent on Earth because the magnetosphere deflects the solar wind. The Moon has collected it unshielded for 4 billion years, making the same isotope a reserve rather than a laboratory curiosity.
EnablesAneutronic fusion fuel, propellant, agriculture
XR-03Cores of shattered protoplanets
M-type asteroid metal
↔Iron, Nickel, Cobalt, Platinum-groupEarth's platinum-group metals sank into the core during differentiation; nearly all we mine arrived later via impactors. Asteroids are those same impactors, undifferentiated and still intact.
EnablesCatalysts, electronics, refined alloy stock
XR-04Permanently shadowed craters, cometary delivery
Polar water ice
↔Hydrogen, Oxygen, DeuteriumThe D/H ratio of lunar and cometary ice fingerprints the same reservoir that delivered Earth's oceans. Electrolysis splits it into exactly the propellant pair chemical rockets already burn.
EnablesLOX/LH₂ propellant, life support, fusion deuterium
XR-05C-type asteroids, primitive solar nebula material
Carbonaceous chondrite
↔Carbon, Sulfur, Phosphorus, ClaysThese bodies preserve the pre-biotic organic chemistry that seeded terrestrial life. The same carbon feeds Sabatier loops and graphene synthesis instead of biology.
EnablesGraphene, fertilizer, closed-loop carbon
XR-06Flotation crust of the lunar magma ocean
Anorthosite highlands
↔Calcium, Aluminum, Rare earthsAnorthosite is a common terrestrial igneous rock, but on the Moon it forms entire continents, giving an aluminum-calcium feedstock at grades no Earth deposit matches.
EnablesAluminum alloys, cement analogs, glass