In this lab we examine a variety of limestones, sandstones, and marbles. We measure their density, elastic modulus, sorptivity (rate of uptake of water), and strength. Some samples are also examined in the optical microscope and the scanning electron microscope (SEM). In another lab, we measure the same properties for a variety of mortars, including one made using a Roman recipe. We then compare the properties of the stones and the mortars to determine which will be compatible with the other.