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Needle Snow Crystals

From Anne Marie Helmenstine, Ph.D., About.com

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Needles are slender ice crystals that tend to form when the temperature is about -5 degrees Celsius.

Needles are slender columnar ice crystals that tend to form when the temperature is around -5 degrees Celsius. The large photo is an electron micrograph. The inset is a light micrograph.

USDA Beltsville Agricultural Research Center

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