anthracite

When pure and of close hard grain it is used as a refractory for lining furnaces, especially those designed for anthracite.

There are four types: bituminous (soft), anthracite (hard), semi-bituminous and semi-anthracite.

Tried at a measured mile with anthracite and Merthyr coal mixed, three years afterwards, her average speed was 11 knots.

He was of middle age, black as anthracite coal, bald-headed, (p. 226) and was dressed in pants and coat made of old sailcloth.

The cooking-range, a large one designed to burn anthracite coal, was the general warming apparatus.