hornfels density of crushed basalt granite

The hardness of Hornfels is 2-3 whereas its compressive strength is 5.80 N/mm 2. Streak is the color of rock when it is crushed or powdered. The streak of Hornfels is unknown whereas its fracture is conchoidal. Luster of Hornfels is the interaction of light with the surface of Hornfels. Luster of Hornfels is shiny. Hornfels cleavage is perfect.