Know all about Andesite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Andesite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Andesite is Aphanitic to Porphyritic whereas that of Siltstone is Clastic. Andesite appears Dull and Soft and Siltstone appears Rough. The luster of Andesite is vitreous while that of Siltstone is dull. Andesite is available in bluish - grey, grey, pink, yellow colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Andesite are commemorative tablets, creating artwork and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.