If a rock containing kyanite, sillimanite, and andalusite were to undergo an increase in pressure, what must happen to temperature in order for that rock to continue to have stable kyanite, sillimanite, and andalusite?
A) temperature must increase
B) temperature must decrease
C) temperature must stay the same
D) It is impossible for it to continue to have stable kyanite, sillimanite, and andalusite.

Question

Quizplus · Accepted Answer

Kyanite, sillimanite, and andalusite are polymorphs of Al2SiO5, meaning they have the same chemical composition but different crystal structures. They form under different conditions of temperature and pressure, and it is not possible for all three to be stable at the same time under a change in conditions.

If a Rock Containing Kyanite, Sillimanite, and Andalusite Were to Undergo