What determines when a rock melts?

Ultimately it is the composition of the minerals that make it up. The melting point of any mineral is dependent on how tightly it is bonded together. The stronger the chemical bonds, the higher its melting point will be.

Its types of minerals. To find the paths and locations of when each mineral is going to melt or crystallize can be found in Ternary Diagrams.

The amount of energy to overcome the attraction between positive and negative ions.

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