A mineral, aluminum-blown insulation element, in particular insulation slab, comprising calcium silicate hydrates as framework and blown pores surrounded by the framework, wherein more than 40% by volume, in particular more than 50% by volume, of the blown pores have a diameter of less than 1 mm and more than 75% by volume, in particular more than 85% by volume, of the blown pores have a diameter of less than 2 mm and the thermal conductivity .lamda..sub.10dr is preferably less than 0.045 W/mK.