Hornfels
Hornfels is a dense, fine-grained metamorphic rock formed when heat alters pre-existing rock, usually near an igneous intrusion. Its grains are typically interlocking and lack the aligned layers characteristic of foliated rocks.
Hornfels is a dense, fine-grained metamorphic rock formed when heat alters pre-existing rock, usually near an igneous intrusion. Its grains are typically interlocking and lack the aligned layers characteristic of foliated rocks.