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