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Mineral molecules which are pure can form crystals under the right conditions. The properties of the molecules shape the specific form of the crystals. The molecules arrange themselves in three dimensions in a so-called crystal structure. By determining the type of crystal and the exact angles between the crystal planes, the type of mineral can be determined. Crystals can form by the slow cooling of molten rock, but also by precipitation from dissolved minerals in water. For more information see the information page Chemicals and minerals.
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