Which coal class is described as hard, black, and having energy content of about 14,000 BTU?

Which coal class is described as hard, black, and having energy content of about 14,000 BTU?

• A. Lignite
• B. Subbituminous
• C. Bituminous
• D. Anthracite

Answer: (D)

Anthracite coal fits this description. It is the hardest and most compact coal, with a glossy black appearance and the highest carbon content among coal types. Its energy content is very high, typically around 12,000 to 15,000 BTU per pound, commonly cited near 14,000 BTU. That combination of being hard and delivering that level of heat aligns with the description. Lignite is softer and has much lower energy content, while subbituminous and bituminous coal have lower to intermediate energy values and are not as hard as anthracite.

Anthracite coal fits this description. It is the hardest and most compact coal, with a glossy black appearance and the highest carbon content among coal types. Its energy content is very high, typically around 12,000 to 15,000 BTU per pound, commonly cited near 14,000 BTU. That combination of being hard and delivering that level of heat aligns with the description. Lignite is softer and has much lower energy content, while subbituminous and bituminous coal have lower to intermediate energy values and are not as hard as anthracite.