Know all about Trondhjemite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Trondhjemite is Phaneritic whereas that of Siltstone is Clastic. Trondhjemite appears Banded and Foilated and Siltstone appears Rough. The luster of Trondhjemite is subvitreous to dull while that of Siltstone is dull. Trondhjemite 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 Trondhjemite are cemetery markers, creating artwork and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.