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The type of mineral formed by cooling magma is primarily determined by the magma's chemical composition, particularly its silica content. As magma cools, different minerals crystallize at varying temperatures, a process known as fractional crystallization. Additionally, the cooling rate influences mineral formation; slower cooling allows larger crystals to grow, while rapid cooling results in smaller crystals or even glassy textures. Factors such as pressure and the presence of volatile substances can also impact mineral development.

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