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