Review Questions for Lecture 13: Mantle Minerals;
                Transition Zone and Lower Mantle

1. Beginning with olivine, describe the changes that occur
    to the olivine structure in the transition zone and in
    in the lower mantle.

2. Describe the mineralogical/structural changes that occur
    in the transition zone.

3.   Why does density of minerals increase?

4.  Beginning at the upper mantle, describe the major minerals and/or
    structure that occur  in each division of the mantle.

5. What is perovskite?

6. Describe the chemistry of the two main garnet groups.
    What site has solid solution?
    What are some identifying physical characteristics?
    Can color be used for identification? Why or why not?