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Ice crystals - small crystalline form of ice including hexagonal columns, hexagonal plates, dendritic crystals, and diamond dust.
Temperature and water vapor humidity determine crystalline forms. Ice crystals are responsible for various atmospheric optics displays in the atmosphere. The principal axis (c axis) of a single crystal of ice is perpendicular to the axis of hexagonal symmetry. Planes perpendicular to this axis are called basal planes. Ice clouds are composed of ice crystals. The most notable one is cirrus and ice fog.
Geometry
Geometry