Ye'elimite is the naturally occurring form of anhydrous calcium sulfoaluminate, Ca4(AlO2)6SO4.

It gets its name from Har Ye'elim in Israel in the Hatrurim Basin west of the Dead Sea where it was first found in nature by Shulamit Gross, an Israeli mineralogist and geologist who studied the Hatrurim Formation.

[6] Ye'elimite is most commonly encountered as a constituent of sulfoaluminate cements,[7] in which it is manufactured on the million-tonne-per-annum scale.

On hydration in the presence of calcium and sulfate ions, it forms the insoluble, fibrous mineral ettringite, which provides the strength in sulfoaluminate concretes, monosulfoaluminate, and aluminium hydroxide.

On heating above 1350 °C, ye'elimite begins to decompose to tricalcium aluminate, calcium oxide, sulfur dioxide and oxygen.