anthracite coal in sizes ranging from about 3/8 to about 13/16 inch (1 to 2 cm).
bituminous coal in sizes ranging from about 3/8 to about 3/4 inch (1 to 1.9 cm).
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Origin of pea coal
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019