Know all about Argillite and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Anorthosite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Anorthosite is Foliated, Glassy. Argillite appears Rough and Dull and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Argillite is waxy and dull while that of Anorthosite is pearly to subvitreous. Argillite is available in dark grey to black, pink, red, white colors whereas Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Anorthosite are creating artwork, curling.