That is definitely wrong.
Adding to what Gokul mentioned, metals are usually denser that rock and ceramics. Compare with steel's specific gravity of ~ 7.5-8, depending on alloying elements and composition.
Density of common minerals - http://www.mininglife.com/Miner/general/Density.htm
Specific Gravity Table For Ceramics, Metals & Minerals - http://www.reade.com/Particle_Briefings/spec_gra.html
Generally metals are two or three time denser than minerals/ceramics (i.e. metal oxides). Also, surface minerals are likely to have porosity of several %.