Know all about Rapakivi Granite and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Rapakivi Granite belongs to Igneous Rocks while Argillite belongs to Sedimentary Rocks.Texture of Rapakivi Granite is Granular, Phaneritic whereas that of Argillite is Clastic, Polished. Rapakivi Granite appears Veined or Pebbled and Argillite appears Rough and Dull. The luster of Rapakivi Granite is dull to grainy with sporadic parts pearly and vitreous while that of Argillite is waxy and dull. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Rapakivi Granite are cemetery markers, commemorative tablets, creating artwork, curling, laboratory bench tops, tombstones and that of Argillite are fire resistant, used to manufracture paperweights and bookends.