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