Know all about Trachyte and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Trachyte belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Trachyte is Aphanitic to Porphyritic whereas that of Siltstone is Clastic. Trachyte appears Banded and Siltstone appears Rough. The luster of Trachyte is metallic while that of Siltstone is dull. Trachyte is available in black, brown, dark greenish - grey, green, grey, light to dark grey, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Trachyte are cemetery markers, creating artwork and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.