A process for producing a mineral foam includes (i) separately preparing one or more slurries of cement, and an aqueous foam for which a D50 of bubbles is less than or equal to 400 μm; (ii) homogenizing the one or more slurries of cement with the aqueous foam to obtain a slurry of foamed cement; (iii) casting the slurry of foamed cement and leaving the cast slurry of foamed cement to set.