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Rime and Hoar
According to wikipedia:
The distinction between hoar frost and rime ice is that in formation of hoar frost, the water vapour condenses through deposition directly to solid ice, while the rime ice is formed following initial condensation into liquid droplets. Thus, hoar frost is formed when the dew point is warmer than surface but colder than the air temperature, and colder than freezing point.
I couldn't rightly tell you which one this is.
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