Properties of Claystone and Lignite play an important role in determining the type of rock. Along with Claystone vs Lignite properties, get to know more about Claystone Definition and Lignite 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 Claystone and Lignite.