Know all about Siltstone and Phyllite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Phyllite belongs to Metamorphic Rocks.Texture of Siltstone is Clastic whereas that of Phyllite is Phyllitic Sheen, Slaty. Siltstone appears Rough and Phyllite appears Crinkled or Wavy. The luster of Siltstone is dull while that of Phyllite is phyllitic. Siltstone is available in brown, red, reddish brown colors whereas Phyllite is available in black to grey, light greenish grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Phyllite are cemetery markers, commemorative tablets, creating artwork, writing slates.