Assertion: graphite | /r/HasProperty | the highest grade of coal
Facets:
value: above anthracite
type: OTHER
value: despite being difficult
type: OTHER
Source sentences:
text: Graphite may be considered the highest grade of coal, just above anthracite and alternatively called meta-anthracite, although it is not normally used as fuel because it is difficult to ignite.
text: Graphite is used as the standard state for defining the heat formation of carbon compounds, and it may be considered the highest grade of coal, despite being difficult to set on fire.
text: Graphite may be considered the highest grade of coal, just above anthracite and alternatively called meta-anthracite, although it is not normally used as fuel because it is hard to ignite.