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TeachMeFinance.com historic definition... Anthracite coal -- Commonly called hard coal ; mineral coal, with a bright, sub-metallic, iron-black lustre, consisting of nearly pure carbon and burning almost without flame. It is graded into eight sizes: Buckwheat (the smallest size), pea, cherry, chestnut, stove, egg, broken and steamship (the largest size). Anthracite coal contains a very small amount of volatile matter. Anthracite proper contains from 3 to 10 per cent of such matter; graphitic anthracite contains from 1 to 3 per cent. About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2007 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional financial or legal advice. TeachMeFinance.com and its owner recommend consultation with a professional financial advisor prior to any investment or financial decision. Please read our disclaimer.