Know all about Siltstone and Mylonite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Mylonite belongs to Metamorphic Rocks.Texture of Siltstone is Clastic whereas that of Mylonite is Foliated. Siltstone appears Rough and Mylonite appears Dull, Banded and Foilated. The luster of Siltstone is dull while that of Mylonite is shiny. Siltstone is available in brown, red, reddish brown colors whereas Mylonite is available in black to grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Mylonite are creating artwork, gemstone, jewelry.