Know all about Rhyodacite and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Porphyry belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Porphyry is Porphyritic. Rhyodacite appears Skeletal and Porphyry appears Dull. The luster of Rhyodacite is greasy to dull while that of Porphyry is dull. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Rhyodacite are cemetery markers, creating artwork and that of Porphyry are creating artwork, gemstone, jewelry.