X-ray diffraction measurements of natural talc plus water at combined pressures and temperatures of 0–15 GPa and 23–400 °C reveal the presence of a structural change that could be interpreted as a new high-pressure phase at 4.0 (±0.5) GPa, and raise the possibility that the newly inferred phase transition takes place in cold subducting slabs as a precursor to appearance of the 10 Å phase of talc.

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