Know all about Hornfels and Tachylite properties here. All properties of rocks are important as they define the type of rock and its application. Hornfels belongs to Metamorphic Rocks while Tachylite belongs to Igneous Rocks.Texture of Hornfels is Granular, Platy whereas that of Tachylite is Vitreous. Hornfels appears Dull and Tachylite appears Glassy. The luster of Hornfels is shiny while that of Tachylite is resinous. Hornfels is available in brown, dark greenish - grey, green, reddish brown colors whereas Tachylite is available in black, dark brown colors. The commercial uses of Hornfels and Tachylite are cemetery markers, commemorative tablets, creating artwork.