anthracite in sizes ranging from 2.44 to 3.25 inches (8 to 8 cm), intermediate between broken coal and stove coal.
bituminous coal in sizes ranging from 1.5 to 4 inches (4 to 10 cm).
Origin of egg coal
An Americanism dating back to 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for egg coal
Historical Examples of egg coal
My gifts do not run to the care of a horse and an egg-coal fire.Dwellers in Arcady
Albert Bigelow Paine