Abstract

An earlier paper (Adler, 1964) presented infrared absorption data on the ν3 and ν1 vibrational modes of apatite, pyromorphite, mimetite, and vanadinite. Investigation of these minerals at longer wavelengths has revealed two interesting and undescribed spectral features of minera-logical interest, namely the ν4 frequency shift and splitting associated with substitution of PO43- for AsO43- in the mimetite lattice.

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