Ice Needles: Ice crystals which are long and thin with a hexagonally-shaped cross section, thinner than ice columns. Ice needle formation is favoured at air temperatures from -4° C to -6° C (25° F to 21° F) ...
—A form of ice crystals.
ice pellets—Small, transparent or translucent, round or irregularly shaped pellets of ice.
The ice needles are typically a few centimetres long. While growing, they may lift or push away small soil particles. On sloped surfaces, needle ice may be a factor contributing to soil creep. ...
ICE CRYSTALS Precipitation in the form of slowly falling, singular or unbranched , columns, or plates. They make up cirriform clouds, frost, and ice fog. Also, they produce optical phenomena such as halos, coronas, and sun pillars.
See also: Frost, Temperature, Weather, Radiation, Precipitation