Rock | Hornfels | Recrystallized silicates | Metamorphic
Hornfels forms when rocks are baked by contact metamorphism, producing a hard, fine-grained texture. Occurs as rare glacial erratics from metamorphic aureoles.
Hornfels Displays These Colors
Gray | Brown | Black
Hornfels is Found in These Surrounding States
Ohio | Indiana | Kentucky | West Virginia | Pennsylvania | Michigan