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We present the results of experimental studies on mineral and phase transformations in the model system K 2 O(Li 2 O)-Al 2 O 3 -SiO 2 -H 2 O-HF at 300 to 600 °C and 100 MPa using the method of univariant assemblages. The phase diagrams involve equilibrium curves among topaz, andalusite, muscovite, pyrophyllite, AlF 3 , and K n AlF 3+n  built from our experiments, which have allowed us to determine the topaz stability field. Topaz is stable in solutions with HF concentrations from 3⋅10 −3  to 8⋅10 −1  m and with KF concentrations lower than 7.5⋅10 −3  m. As temperature increases, topaz becomes stable at higher HF concentrations.

american mineralogist

Experimental study of mineral equilibria in the system K 2 O(Li 2 O)-Al 2 O 3 -SiO 2 -H 2 O-HF at 300 to 600 °C and 100 MPa with application to natural greisen systems