Hydrotalcite, or formerly also völknerite, is a layered double hydroxide of general formula Mg6Al2CO316·4H2O, whose name is derived from its resemblance with talc and its high water content. Multiple
Hydrotalcite with serpentine, Snarum, Modum, Buskerud, Norway. Size: 8.4 × 5.2 × 4.1 cm