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depth hoar
Cup shaped crystals (depth hoar, sugar snow) in which a faceted form continues to grow or mature in the presence of a steep temperature gradient. These crystals are heavily striated and can have cup or scroll shapes. The grains typically tend to be very large and are often significantly larger than most other grains that would be found in a snowpack (typical grain size can be more than 3 - 5 mm).
 

 

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29 August 2011
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