rock
black
honfel rocks are made of already existing rocks formed from heat, preasure or a chemical reaction. also its a metamorphic rock.
Hornfels are commonly used as a building material in construction due to their high durability and resistance to weathering. They are also used as decorative stones in landscaping and for creating countertops and other interior designs. Additionally, hornfels can be used for producing aggregates for road construction and railway ballast.