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