Motukoreaite is a mineral with formula Na₂Mg₃₈Al₂₄(SO₄)₈(CO₃)₁₃(OH)₁₀₈·56H₂O. The mineral is named for Motukorea, the island in New Zealand where it was discovered. Motukoreaite was first noted in 1941 and officially described in 1977.