geode, A hollow rock inside which mineral crystals have formed., crystallization, The process by which atoms are arranged to form a material with a crystal structure., magma, The molten mixture of rock-forming substances,gases, and water from the mantle., lava, Liquid magma thar reaches the surface, solution, A mixture in which one substance is dissolved in another., vein, A narrow deposit of a mineral that is sharply different from the surrounding rock.

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