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