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