Single-crystal vibrational spectra of apatite, vanadinite, and mimetite

Abstract
Single-crystal Raman spectra are reported for the three title compounds, and i.r.-reflectance parameters for apatite. An essentially complete assignment is deduced for apatite, including lattice modes, and is in close agreement with the predictions of factor-group analysis. The main features of the Raman spectra of vanadinite and mimetite are similarly accounted for. Factors causing broadening of some low-frequency Raman bands are discussed.

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