Assertion: anthracite | /r/HasProperty | metamorphosed and pure carbon
Facets:
value: almost
type: DEGREE
value: heavily
type: DEGREE
Source sentences:
text: Anthracite coal is often described in layman's terms as 'hard coal' and while it is heavily metamorphosed and almost pure carbon, it is no harder or softer than bituminous, or 'soft' coal.