Apatite

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Apatite is a broad name for group of phosphate minerals very common in igneous and metatmorphic rocks including hydroxyapatite, fluoprapatite, and chlorapatite. It is often mistaken for other minerals including beryl, and in fact the name apatite comes from the Greek word for “to deceive”. It’s used in the manufacture of fetilizer and other industrial products, and occaionally as a gemstone. It was used as a pigment for the Teracotta Army of 3rd century China. Apatite occasionally conatins significant amounts of rare-earth elements.