# Problem: Kyanite, sillimanite, and andalusite all have the formula Al 2SiO5. Each is stable under different conditions (see the graph below). At the point where the three phases intersect:(b) Which mineral, if any, has the lowest enthalpy?

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Kyanite, sillimanite, and andalusite all have the formula Al 2SiO5. Each is stable under different conditions (see the graph below). At the point where the three phases intersect:

(b) Which mineral, if any, has the lowest enthalpy?