Know all about Siltstone and Dacite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Dacite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Dacite is Aphanitic to Porphyritic. Siltstone appears Rough and Dacite appears Vesicular. The luster of Siltstone is dull while that of Dacite is subvitreous to dull. Siltstone is available in brown, red, reddish brown colors whereas Dacite is available in bluish - grey, brown, grey, light to dark grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Dacite are commemorative tablets, creating artwork.