Describe what you see. Any rock , sedimentary, igneous, or metamorphic can be metamorphosed.
Minerals undergoing metamorphism remain solid or partially melt.
Remember, minerals are most stable in the environment from which they formed. Minerals that are unstable at lower temperature and heat will either recrystallize or produce new minerals with more stable structure. Conditions that favor metamorphism Heat . Increases the rate of chemical reactions. Essential in metamorphism.