Ключевые слова: anthracite, background, bituminous, black, brown, carbon, carboniferous, chunk, closeup, coal, combustible, dark, deposit, detail, energy, extraction, formation, fossil, fuel, geology, gray, hard, heap, heat, industry, lignite, lump, macro, material, mineral, mining, natural, pattern, peat, pile, power, raw, resource, rock, rough, sedimentary, shiny, stone, streaks, subbituminous, surface, texture,