RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Nitre. Specimens of crystalline mineral nitre, or saltpeter, potassium nitrate (KNO3). Potassium nitrate and other nitrates are used in fertilizers and, historically, gunpowder. Synthetically produced potassium nitrate is now widely used but the natural mineral is still mined commercially.
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