Know all about Oil shale and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Oil shale and Siltstone belong to Sedimentary Rocks.Texture of Oil shale is Splintery whereas that of Siltstone is Clastic. Oil shale appears Muddy and Siltstone appears Rough. The luster of Oil shale and Siltstone is dull. Oil shale is available in black, brown, buff, green, grey, red, yellow colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Oil shale are an oil and gas reservoir and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.