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