exsolution

/ˌɛksəˈluːʃən/
noun
  1. The process by which a solid solution separates into distinct mineral phases, usually when cooled.
    • Exsolution in the rock created beautiful bands of different colors.
    • The exsolution of feldspar crystals is a common feature in many igneous rocks.
    • Geologists study exsolution to understand how minerals form deep underground.
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