Know all about Rhyodacite and Obsidian properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Obsidian belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Obsidian is Glassy. Rhyodacite appears Skeletal and Obsidian appears Shiny. The luster of Rhyodacite is greasy to dull while that of Obsidian is vitreous. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. The commercial uses of Rhyodacite are cemetery markers, creating artwork and that of Obsidian are creating artwork, mirror, used in aquariums.