Know all about Argillite and Aplite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Aplite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Aplite is Granular, Graphic. Argillite appears Rough and Dull and Aplite appears Veined or Pebbled. The luster of Argillite is waxy and dull while that of Aplite is dull to pearly to subvitreous. Argillite is available in dark grey to black, pink, red, white colors whereas Aplite is available in black, grey, orange, pink, white colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Aplite are curling, gemstone, laboratory bench tops, small sculptures, tombstones.