Know all about Trondhjemite and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Trondhjemite belongs to Igneous Rocks while Argillite belongs to Sedimentary Rocks.Texture of Trondhjemite is Phaneritic whereas that of Argillite is Clastic, Polished. Trondhjemite appears Banded and Foilated and Argillite appears Rough and Dull. The luster of Trondhjemite is subvitreous to dull while that of Argillite is waxy and dull. Trondhjemite is available in black, brown, light to dark grey, white colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Trondhjemite are cemetery markers, creating artwork and that of Argillite are fire resistant, used to manufracture paperweights and bookends.