Know all about Siltstone and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Rhyolite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Siltstone appears Rough and Rhyolite appears Banded. The luster of Siltstone is dull while that of Rhyolite is earthy. Siltstone is available in brown, red, reddish brown colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Rhyolite are gemstone, laboratory bench tops, jewelry.