Review Questions for Lecture 17: Earth's Crust;
1. Compare and contrast the three Al-silicate polymorphs in terms
structure and P-T space.
2. If all three polymorphs occur together in a rock, what would it
about the rocks formation?
3. What are the geologic environments, e.g. P, T, or composition, indicated
4. Why is zircon important to geologists?
What does it have in common with monazite?
5. What minerals compose a greenschist? What kind of rock is a greenschist?
6. BONUS: Why is zircon considered a good material for disposal of high level