Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Amphibolite and Coal. Texture of Amphibolite is Banded, Foliated, Massive whereas that of Coal is Amorphous, Glassy. Based on the texture of rocks, they are used for various purposes. Get detailed information about Amphibolite vs Coal texture, color, appearance and maintenance in the next section.