Know all about Tonalite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Tonalite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Tonalite is Phaneritic whereas that of Siltstone is Clastic. Tonalite appears Banded and Foilated and Siltstone appears Rough. The luster of Tonalite is subvitreous to dull while that of Siltstone is dull. Tonalite is available in black, brown, light to dark grey, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Tonalite are cemetery markers, creating artwork and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.