Interestingly, mineral phases of deep-seated origin have been observed
in ophiolitic ultramafic sequences in the Swiss Alps and Tibet.
For example, three previously unknown structures of FeTiO3 were
identified in peridotites from the Arami Massif, Switzerland, indicating
that the originally-exsolved phase was a high-pressure perovskite
polymorph of ilmenite, implying a minimum depth of origin of
300 km