Of, relating to, or containing anthracite coal.
From anthracite + -ous (Latin -osus, an adjectival suffix meaning 'full of'). This straightforward geological adjective has been used since coal science became systematic in the 1800s.
The word 'anthracitous' perfectly captures how coal scientists think—they're not just saying 'coal,' they're specifying the exact type, which matters because anthracite burns hotter and cleaner than other coals.
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