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In situ, high-pressure single-crystal X‑ray diffraction experiments were performed on a feldspar with composition SrAl 2 Si 2 O 8  (space group I2/c). The measurements were performed at 19 different pressures up to 7.9 GPa. The unit-cell parameters and the unit-cell volume show a strong discontinuity at 6.6 GPa indicating a first-order phase transition. The systematic absences clearly show that the transition occurs from I2/c to P2 1 /c space group symmetry, as for the transition recently reported for a feldspar with composition Sr 0.8 Ca 0.2 Al 2 Si 2 O 8 .

Letter. High-pressure I2/c-P2 1 /c phase transformation in SrAl 2 Si 2 O 8 feldspar