la piedra de la torre está gastada the stone in the tower is ruined. un puente de piedra a stone bridge. ... piedra de molino: millstone. 9. piedra de pómez: pumice stone. 10. piedra de toque: touchstone. 11. piedra imán: lodestone. 12. piedra preciosa: precious stone. Seen Heard . What made you want to look up piedra? Please tell us where ...