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