What is exsolution?

Exsolution is when one thing splits into two different things because it cools down.

Imagine you have a big chocolate bar that’s also made of caramel, they’re all mixed together like friends holding hands. Now, if you put the bar in the fridge, the chocolate and caramel might start to pull apart as they cool. The chocolate might form little squares, and the caramel might stay soft around them, like when you take a bite out of a snack and see layers inside.

Exsolution happens just like that, but instead of chocolate and caramel, it’s usually minerals in rocks. When hot rock cools down slowly, different minerals can separate out, forming patterns or layers you can see in some stones.

When things are hot, the minerals mix well, like when your cereal is all stirred up in milk. But as they cool, they don’t want to stay mixed anymore, it’s like how you might prefer sitting with your friends instead of being scattered around the room. So, they exsolve, they split apart and make their own little groups.