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