Know all about Rhyodacite and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite and Tachylite belong to Igneous Rocks.Texture of Rhyodacite is Earthy whereas that of Tachylite is Vitreous. Rhyodacite appears Skeletal and Tachylite appears Glassy. The luster of Rhyodacite is greasy to dull while that of Tachylite is resinous. Rhyodacite is available in black to grey, dark greenish - grey colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Rhyodacite and Tachylite are cemetery markers, creating artwork.