What are crystals made of?
A crystal is made up of atoms of the same element or atoms of different elements [like silica (Si) or calcium (Ca)], and the atoms have a regular, repeating arrangement. Crystals are very ordered, the arrangement of a certain crystal is always the same.
Crystals are formed in nature when liquid (such as magma) cools and hardens as certain molecules group together in a uniform, repeating pattern.
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