On the join enstatite–diopside at 15 kbar, the reaction pigeonite = diopsidess + enstatitess is in equilibrium at 1465±10° C. The compositions of the three coexisting phases are (mole percent): pigeonite = Wo18.3En81.7 (±1.5); enstatite = Wo5.5En94.5 (±1.0); diopside = Wo28.5En70.5 (±3.5). Experiments were done in a piston cylinder apparatus using trace amounts of water as a flux, and were reversed to establish equilibrium compositions.

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