Emily Dickinson Lexicon

AP'A-TITE, n. [from Gr. απαταω, to deceive; it having been often mistaken for other minerals.]

A variety of phosphate of lime; generally crystalized in low, flat, hexahedral prisms, sometimes even tabular. Its powder phosphoresces on burning coals. The phosphorite of Werner includes the massive and earthy varieties of the phosphate, which are distinguished from the apatite, by their containing a small portion of fluoric acid. – Cleaveland.