Know all about Basalt and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Basalt belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Basalt is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Siltstone is Clastic. Basalt appears Dull and Soft and Siltstone appears Rough. The luster of Basalt is not available while that of Siltstone is dull. Basalt is available in black, brown, light to dark grey colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Basalt are an oil and gas reservoir, commemorative tablets, creating artwork, used in aquariums and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.