FIG. 9. Secondary feldspathic precipitates resulting from the reaction of Na⁺/NO₃^–/OH^– tank waste simulant with Hanford sediment. The dissolution of primary aluminosilicates and reprecipitation of various secondary phases neutralizes the high pH of tank waste. (From Qafoku et al., 2003.) Reproduced with permission from Environ. Sci. Technol. 2003. 37:3640–3646. Copyright 2003 American Chemical Society.