isostructuralism (isomorphism), structural group
polymorphism, polymorphs, reconstructive, displacive, order-disorder
polytypism
metamict
pseudomorphism: substitution,
encrustation, alteration
Give an example of 3 minerals that are related by order-disorder polymorphic transitions.
What are some examples of polytypes?
How does a mineral become metamict?
In a general way, describe how mineral structure changes with depth.