Antrasit is a type of coal that is known for its high carbon content and low impurities. It is the hardest form of coal, with a shiny, black appearance. Due to its high energy density, antrasit is often used as a fuel source in industrial processes and for heating purposes. This coal is primarily found in regions with significant geological activity, such as parts of Pennsylvania in the United States and China. Antrasit burns cleaner than other types of coal, producing less smoke and pollutants, making it a more environmentally friendly option for energy production.