Hydrotalcite is a layered double hydroxide of general formula Mg 6Al 2CO 3(OH) 16·4(H 2O), whose name is derived from its resemblance with talc and its high water content. The layers of the structure stack in multiple ways, to produce a 3-layer rhombohedral), or a 2-layer hexagonal structure (2H polytype) formerly known as manasseite. The two polytypes are often intergrown. The carbonate anions that lie between the structural layers are weakly bound, so hydrotalcite has anion exchange capabilities.
It was first described in 1842 for an occurrence in a serpentine - magnesite, Norway It occurs as an alteration mineral in serpentinite in association with serpentine