Know all about Siltstone and Scoria properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Scoria belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Scoria is Vesicular. Siltstone appears Rough and Scoria appears Glassy and Vesicular. The luster of Siltstone is dull while that of Scoria is subvitreous to dull. Siltstone is available in brown, red, reddish brown colors whereas Scoria is available in black, brown, dark grey to black, red colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills.