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