Abstract: The present invention relates to a foamed or non-foamed stable composition for covering, plastering and insulating walls, floor slabs and ceilings, and also for producing insulating structural elements, casting light and insulating ferro-cement structural systems, insulating piping, ducts, filling spaces, stabilizing floors and producing cements floors, for the constructions industry, which comprises the following components: 30 to 90% anhydrite, 0 to 40% Portland cement, 0 to 70% light and/or heavy fillers, 1 to 10% activator additives, 1 to 20% setting and strength regulator additives and 1 to 12% thickening additives.