2015-7-29 · 1873370 Encyclopædia Britannica, Ninth Edition, Volume II — Anthracite. . ANTHRACITE, Stone Coal, Kilkenny Coal, or Culm, is a variety of coal differing from the common or bituminous kind in containing a larger proportion of carbon in its composition ; that element being present in anthracite to the extent of from 90 to 95 per cent, of its ...