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