burnt shale

British  

noun

1. carbonaceous shale formed by destructive distillation of oil shale or by spontaneous combustion of shale after it has been some years in a tip: sometimes used in road making

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Example Sentences

Cemex officials said the company plans to lower emissions in part by using clinker substitutes that are byproducts of other industrial processes, such as burnt shale oil or glass furnace slag.

From Reuters

Fifty tons of this burnt shale are required to make one ton of alum.

From Project Gutenberg

Of these, oyster or marine shells, burnt shale, and slag are most common.

From Project Gutenberg

Its base consists almost entirely of pumice, in which are included fragments of basalt and other lavas, pieces of burnt shale, slate, and sandstone, and numerous trunks and branches of trees.

From Project Gutenberg