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A close-up of growing ice crystals displaying typical hexagonal symmetry.

Ice crystals are solid ice in symmetrical shapes including hexagonal columns, hexagonal plates, and dendritic crystals.^[1] Ice crystals are responsible for various atmospheric optic displays and cloud formations.^[1]^[2]

^ ^a ^b "ice crystal". Glossary of Meteorology. American Meteorological Society. Retrieved 2023-03-29.
^ "Ice Crystal Halos". www.its.caltech.edu. Retrieved 2023-03-30.