Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Greywacke and Harzburgite. Texture of Greywacke is Clastic whereas that of Harzburgite is Phaneritic. Based on the texture of rocks, they are used for various purposes. Get detailed information about Greywacke vs Harzburgite texture, color, appearance and maintenance in the next section.