The solubility of quartz plates in water has been measured at temperatures ranging to 610 degrees C and at pressures ranging to 1,750 bars. Rate of solution of the quartz plates depends on temperature, orientation of the quartz plate and on minute compositional differences in quartz. The solubility determinations have been made along the three-phase boundary, quartz-gas-liquid; and in two two-phase fields, quartz-liquid and quartz-gas. No break is encountered in the solubility curves as they cross the boundary between the quartz-gas and quartz-liquid fields, provided that the specific volume of the fluid phase is held constant.The solubility of quartz in water is much lower than is the solubility of quartz glass or colloidal silica in water.

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