Know all about Argillite and Rhomb Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Rhomb Porphyry belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Rhomb Porphyry is Aphanitic to Porphyritic. Argillite appears Rough and Dull and Rhomb Porphyry appears Rough. The luster of Argillite is waxy and dull while that of Rhomb Porphyry is subvitreous to dull. Argillite is available in dark grey to black, pink, red, white colors whereas Rhomb Porphyry 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 Rhomb Porphyry are an oil and gas reservoir, as a feed additive for livestock, metallurgical flux, soil conditioner, source of magnesia (mgo).