a common mineral, calcium fluorophosphate, Ca 5 FP 3 O 12 , occurring in individual crystals and in masses and varying in color, formerly used in the manufacture of phosphate fertilizers.

1795–1805; < Greek apát(ē) trickery, fraud, deceit + -ite1

apatite, appetite.
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World English Dictionary
apatite (ˈæpəˌtaɪt)
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
[C19: from German Apatit, from Greek apatē deceit; from its misleading similarity to other minerals]

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American Heritage
Science Dictionary
apatite   (āp'ə-tīt')  Pronunciation Key 
Any of several, usually green, transparent, hexagonal minerals consisting of calcium phosphate with either fluorine, hydroxyl, chlorine or carbonate. Apatite occurs in igneous, metamorphic, and sedimentary rocks, and is used as a source of phosphate for making fertilizers. Chemical formula: Ca5(PO4CO3)3(F,OH,Cl).
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