Know all about Siltstone and Basaltic Trachyandesite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Basaltic Trachyandesite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Basaltic Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Siltstone appears Rough and Basaltic Trachyandesite appears Dull and Soft. The luster of Siltstone is dull while that of Basaltic Trachyandesite is not available. Siltstone is available in brown, red, reddish brown colors whereas Basaltic Trachyandesite is available in black, brown, light to dark grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Basaltic Trachyandesite are an oil and gas reservoir, commemorative tablets, creating artwork.