Review Questions for Lecture 19:  Earth's Crust;

1. Describe the anionic complex that characterizes this non-silicate group?
    Why is it called a 'radical'? What is the bond strength within/outside
    of the group.

2.  Why does CaCO3 form two polymorphs?
        These polymorphs also define groups. Whatis the main difference between these
         Is there solid solution between the groups? why/why not?

3. Describe distinguishing features of the rhombohedral carbonates.

4. What are the geologic environments/conditions, e.g. P, T, or composition, indicated by:

5. Compare and contrast crystal forms, properties of
    calcite and dolomite

6. What geologic environments form carbonates?