WordReference Random House Unabridged Dictionary of American English © 2017
ap•a•tite  (apə tīt′),USA pronunciation n. 
  1. Mineralogya common mineral, calcium fluorophosphate, Ca5FP3O12, occurring in individual crystals and in masses and varying in color, formerly used in the manufacture of phosphate fertilizers.
  • Greek apát(ē) trickery, fraud, deceit + -ite1
  • 1795–1805

Collins Concise English Dictionary © HarperCollins Publishers::

apatite /ˈæpəˌtaɪt/ n
  1. 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
Etymology: 19th Century: from German Apatit, from Greek apatē deceit; from its misleading similarity to other minerals

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