Know all about Rhyodacite and Itacolumite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite belongs to Igneous Rocks while Itacolumite belongs to Sedimentary Rocks.Texture of Rhyodacite is Earthy whereas that of Itacolumite is Clastic, Granular, Rough. Rhyodacite appears Skeletal and Itacolumite appears Rough. The luster of Rhyodacite is greasy to dull while that of Itacolumite is dull. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Itacolumite is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Rhyodacite are cemetery markers, creating artwork and that of Itacolumite are an oil and gas reservoir, in aquifers, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones.