Black gunpowder

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A mixture of potassium nitrate (saltpeter), sulfur, and charcoal in varying proportions. A typical composition is 70% to 75% saltpeter, 10% to 14% sulfur, and 14% to 16% charcoal. It is designated according to grain size: mealed; superfine grain (FFG); fine grain (FG); large or coarse grain (LG); large grain for rifles (RLG); and mammoth. Syn: black powder

Source: Dictionary of Mining, Mineral, and Related Terms

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