High-temperature structure and crystal chemistry of hydrous alkali-rich beryl from the Harding pegmatite , Taos County , New Mexico

The structure of hydrous Li-, Cs-, and Na-rich beryl from the Harding, New Mexico, pegmatite has been refined to an R factor of 0.050 using single-crystal X-ray methods. Alkali ions plus water molecules were located by difference Fourier methods in two sites within the channels paralleling c. Orientation of water molecules was determined from polarized IR spectra. The resulting structural formula is

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