Assertion: anthracite | /r/HasAspect | the fewest impurities
Facets:
Source sentences:
text: It has the highest carbon count, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite.
text: Anthracite coal has fewer impurities so it burns cleaner than soft coal, with almost no smoke, which made it particularly well-suited for heating.
text: It has the least amount of impurities, giving it the name
text: It has the highest carbon count, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite.