Assertion: anthracite | /r/HasProperty | formed
Facets:
value: from bituminous coal
type: OTHER
Source sentences:
text: Thus first lignite (also called "brown coal"), then sub-bituminous coal, bituminous coal, and lastly anthracite (also called "hard coal" or "black coal") may be formed.
text: Anthracite coal was formed from bituminous coal when great pressures had developed in the folded rock.
text: Anthracite is formed when other lower ranked coal types are subjected to higher temperature over a long period of time.
text: Thus first lignite (also called "brown coal"), then sub-bituminous coal, bituminous coal, and lastly anthracite (also called "hard coal" or "black coal") may be formed.