Use Figure 6.18 to determine whether andalusite, kyanite, or sillimanite is stable under the following pressure (P) and temperature (T) conditions:

? P = 1 kb, T = 500 °C
? P = 2 kb, T = 650 °C
? P = 4 kb, T = 450 °C
? P = 5 kb, T = 650 °C
What will be an ideal response?


P = 1 kb, T = 500 °C Andalusite stable
P = 2 kb, T = 650 °C Sillimanite stable
P = 4 kb, T = 450 °C Kyanite stable
P = 5 kb, T = 650 °C Sillimanite stable

Environmental & Atmospheric Sciences

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