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