Civil Thinking

Consequences of Metamorphism

Phase Change

-One mineral will change into a new mineral

-AGAIN:  it is the same composition.

To the right is a Pressure-Temperature diagram for the composition Al2SiO5.  Depending on the specific pressure and temperature, Al2SiO5 will be a unique mineral.

*FYI:  GPa is the pressure unit “Gigapascals.”   0.2 GPa is the equivalent pressure of being buried about 6 km depth beneath the surface of the earth.

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