Sub-bituminous coal
Coal type
Sub-bituminous coal is a lower grade of coal that contains 35–45% carbon. The properties of this type are between those of lignite, the lowest grade of coal, and those of bituminous coal, the second-highest grade of coal. Sub-bituminous coal is... Wikipedia
Colors: Bright jet-black and Dull dark brown to black
Carbon content: 35% to 45% carbon