In their paper on the solubility mechanism of H2O in silicate melts at high pressures and high temperatures, Mysen et al. (1980) have used Raman spectroscopy to identify the molecular configurations present in quenched melts of compositions NaAl Si2O6, jadeite, and NaAlSi3O8, albite. They have used both H2O and D2O in various concentrations up to ~40 mole %. Any conclusions reached on the basis of these Raman studies strongly depend upon the band assignments made early in this paper. I would like to point out some errors in the assignments that affect the whole discussion that follows.

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