Assertion: anthracite | /r/HasProperty | difficult to ignite
Facets:
value: very
type: DEGREE
Source sentences:
text: Although anthracites are difficult to ignite, they burn with a pale blue flame and require little attention to sustain combustion.
text: Anthracite, also known as stone coal or rock coal, is very difficult to ignite, mine, clean, and break into smaller chunks and requires correct conditions to build heat or hold temperature and sustain burning—which oft depend upon the size and uniformity of the coal particles.
text: This means anthracite is difficult to ignite but once it gets going will burn longer and slower than any other type of coal.