Know all about Siltstone and Diabase properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Diabase belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Diabase is Aphanitic, Granular. Siltstone appears Rough and Diabase appears Vesicular. The luster of Siltstone is dull while that of Diabase is not available. Siltstone is available in brown, red, reddish brown colors whereas Diabase is available in dark grey to black colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Diabase are an oil and gas reservoir, cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones.