Global — regolith covers entire Martian surface
Estimated Quantity
~43% regolith by weight is iron oxides (primarily hematite, goethite, ferrihydrite)
APXs data from Opportunity, Curiosity, Perseverance
As of 2021-01-01
The iconic rust-red color of Mars is caused by iron oxide in the regolith — primarily nanophase ferric oxides. APXS instruments on multiple rovers have quantified composition. Martian regolith is remarkably consistent globally: ~40-45% SiO2+Fe2O3, ~10% MgO, ~7% CaO with trace sulfur and chlorine. While unsuitable as-is for agriculture (perchlorates), regolith sintered at 700°C could form structural bricks without any binding agent.
Structural material for 3D-printed habitats (analogous to terrestrial sintered bricks), iron extraction for manufacturing, thermal mass for passive heating
Confidence: high · Last verified 2026-06-01
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