Rocks and Minerals. Minerals. A naturally occuring, inorganic, solid with a definate composition and an orderly arrangement of atoms. Crystals.
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A mineral will form crystals when the atoms arrange in a pattern. The larger the crystal the longer it took to develop. Minerals formed when magma cools slowly will form large crystals. When lava cool rapidly it will form very small crystals. They may be to small to see with the naked eye. Crystals can also form from dissolved liquids.