Assertion: anthracite | /r/CapableOf | differ by its greater hardness
Facets:
value: from ordinary bituminous coal
type: OTHER
Source sentences:
text: Anthracite differs from ordinary bituminous coal by its greater hardness (2.75–3 on the Mohs scale), its higher relative density of 1.3–1.4, and luster, which is often semi-metallic with a mildly brown reflection.