deltaite

noun, often capitalized
del·ta·ite | \ˈdeltəˌīt\
plural -s

Definition of deltaite 

: a mineral Ca2Al2(PO4)2(OH)4.H2O consisting of a basic hydrous phosphate of calcium and aluminum

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History and Etymology for deltaite

delta entry 1 (Greek letter) + -ite; from the triangular appearance of the crystals in cross section

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