Know all about Picrite and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Picrite belongs to Igneous Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Picrite is Earthy, Rough whereas that of Hornfels is Granular, Platy. Picrite appears Rough and Shiny and Hornfels appears Dull. The luster of Picrite is subvitreous to dull while that of Hornfels is shiny. Picrite is available in black, brown, colourless, green, grey, pink, white, yellow colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Hornfels are cemetery markers, commemorative tablets, creating artwork.