anthracite

Founding-era definition · Webster's 1828 American Dictionary

AN'THRACITE, noun [Gr. a burning coal; infra.] Slaty glance-coal, or columnar glance coal; that species of coal which has a shining luster, approaching to metallic, and which burns without smoke, and with intense heat. It consists essentially of carbon.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI

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