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There are two known processes by which magma ceases to exist: by volcanic eruption, or by crystallization within the crust or mantle to form a pluton. In both cases the bulk of the magma eventually cools and forms igneous rocks.
Melting Points of Rocks. Igneous rocks form through the crystallization of magma. There is a considerable range of melting temperatures for different compositions of magma. All the silicates are molten at about 1200Â°C and all are solid when cooled to about 600Â°C.Often the silicates are grouped as high, medium and low-melting point solids.elting Points of Rocks. Igneous rocks form through the crystallization of magma. There is a considerable range of melting temperatures for different compositions of magma. All the silicates are molten at about 1200Â°C and all are solid when cooled to about 600Â°C.