Metamorphic rocks are classified primarily by their (foliated vs. non-foliated) and composition . A dichotomous key helps identify these rocks through a series of binary choices based on physical properties like mineral alignment, grain size, and hardness. Metamorphic Rock Identification Key
The following key is a simplified guide based on common diagnostic features. Rock dichotomous key - Level 7, Level 8 | Science - Arc Metamorphic Rock Dichotomous Key