Review Questions for Lecture 10: Upper Mantle Mineralogy

1. What is solid solution?
    What is required for "good" substitutional solid solution?
    How do pressure (P) and temperature (T) affect solid solution?

2. Why do Fe and Mg often substitute for one another, but K and Mg do not?

3. How can you distinguish olivine from pyroxene?

4. Write a chemical formula for 85% endmember fayalite and 15% forsterite.