Properties of Alkali Feldspar Granite and Pumice play an important role in determining the type of rock. Along with Alkali Feldspar Granite vs Pumice properties, get to know more about Alkali Feldspar Granite Definition and Pumice Definition. For the ease of understanding, the properties of rocks are divided into physical and thermal properties. Rocks have a variety of properties like hardness, color, specific gravity, fracture, cleavage, luster etc. Know all about physical and thermal properties of Alkali Feldspar Granite and Pumice.