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