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