单词 | apatite |
释义 | Word Frequency apatite(ˈæpəˌtaɪt) noun a pale green to purple mineral, found in igneous rocks and metamorphosed limestones. It is used in the manufacture of phosphorus, phosphates, and fertilizers. Composition: calcium fluorophosphate or calcium chlorophosphate. General formula: Ca5(PO4,CO3)3(F,OH,Cl). Crystal structure: hexagonal Word origin C19: from German Apatit, from Greek apatē deceit; from its misleading similarity to other minerals |
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