A natural dark brown to black graphitelike material used as a fuel, formed from fossilized plants and consisting of amorphous carbon with various organic and some inorganic compounds.

• 煤一种天然的深褐色到黑色石墨样原材料，用作燃料，由植物化石形成，由非结晶碳和各种有机化合物与一些无机化合物组成