Know all about Siltstone and Adakite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Adakite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Adakite is Porphyritic. Siltstone appears Rough and Adakite appears Dull and Soft. The luster of Siltstone is dull while that of Adakite is grainy, pearly and vitreous. Siltstone is available in brown, red, reddish brown colors whereas Adakite is available in black, brown, light to dark grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Adakite are commemorative tablets, pottery, used in aquariums.