Know all about Theralite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Theralite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Theralite is Phaneritic whereas that of Siltstone is Clastic. Theralite appears Veined and Shiny and Siltstone appears Rough. The luster of Theralite is waxy and dull while that of Siltstone is dull. Theralite is available in dark grey to black colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Theralite are cemetery markers, commemorative tablets, creating artwork, laboratory bench tops, jewelry, sea defence, tombstones and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.