It really depends on the freezing process each snowflake is subjected to. It starts with a speck of dust in the air that allows the super cooled water in the atmosphere to crystalize. Then, depending on the humidity/water saturation, temperature, and a few other variables you get the shapes of a snowflake. The variables change very quickly where the snow is forming and that’s how you get the unique shapes from cones to 6 sided and complex flakes.
[https://youtu.be/ao2Jfm35XeE](https://youtu.be/ao2Jfm35XeE) Veritasium did a great video on it and the scientist he consulted with actually shows you how snowflakes form in real time.
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