About Pumice, stone; 641 kilograms [kg] of Pumice, stone fit into 1 cubic meter; 40.01632 pounds [lbs] of Pumice, stone fit into 1 cubic foot; Pumice, stone weighs 0.641 gram per cubic centimeter or 641 kilogram per cubic meter, i.e. density of pumice, stone is equal to 641 kg/m³. In Imperial or US customary measurement system, the density is equal to …