iridescent coal.

Mining. Slaty or shaly material embedded in coal seams; coal containing such material. Cf. bony, adj. 3.

(a) a thinly foliated variety of coal, esp. one consisting of the matted remains of the cuticles of plants; (b) the resinous mineral dysodile (rare).

U.S. A variety of coal producing ash of a red colour when burned (more fully red ash coal); frequently attributive.

coal from which oil is obtained.

(a) English regional yellow rattle, Rhinanthus minor (cf. sense 1) (rare); (b) shaly coal; also in plural (now rare).

Anglicized as/ˈfjuːzeɪn/. A friable, porous type of coal that occurs as dull layers or masses in bituminous seams; ‘mineral charcoal’.

Scottish. A kind of fine-grained coal or jet used for making marks on wood and stone. Obsolete. rare.

A kind of coal; an ingredient of coal (see quots.).

A black, highly lustrous, and often brittle type of coal.