Anthracite

Anthracite, an extremely non-bituminous coal, containing 90 to 95 per cent of carbon. It has a sub-metallic lustre, is sometimes iridescent, has a conchoidal fracture, is harder and heavier than ordinary coal, and does not soil the fingers. It ignites with difficulty, but burns with an intense heat and without smoke. It occurs where coal-seams have been contorted, as in South Wales and Kilkenny.