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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.
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