This snow crystal formation is called a Japanese tsuzumi for its resemblance to the hourglass-shaped drum of the same name. Courtesy, Erbe, Pooley: USDA, ARS, EMU. "All of the micrographs on the web site are in the public domain and can be freely used." --Christopher Pooley. Source not available online. Reference: http://emu.arsusda.gov/snowsite/comparison/comp2.html

Source: English Wikipedia, original upload 24 March 2005 by Brian0918

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