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The pressure dependence of the anorthite Raman spectrum has been investigated to 11.4 GPa at room temperature using a single crystal in a diamond-anvil cell. We observe a first-order phase transition on increasing pressure at 2.6 GPa, which is consistent with the p1̅-I1̅ transition reported in previous X-ray diffraction experiments. Changes in the Raman spectrum also reveal an additional displacive reversible phase transition to a new phase at 10 GPa. Still not fully characterized, the new phase contains much shorter T-O bond lengths, indicating a major change in the compression mechanism above 10 GPa.

A new high-pressure phase transition in anorthite (CaAl 2 Si 2 O 8 ) revealed by Raman spectroscopy