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23rd Jan 2020 20:07 UTCRalph Bottrill Manager

Very cool but hard to believe they are single crystals!

23rd Jan 2020 20:42 UTCKelly Nash Expert

The general shape reminds me of a type of snowflake called "capped columns". These form when a crystal starts out as a column and then moves into a different temperature zone and changes to a more tabular form. 

25th Jan 2020 18:04 UTCUwe Kolitsch Manager

Kelly: Very nice. Were these collected or produced under special freezing conditions?

25th Jan 2020 18:11 UTCKelly Nash Expert

I think they are natural, but it is not spelled out specifically on the website
(Caltech - Snowfalkes):

24th Jan 2020 18:20 UTCEd Clopton Expert

Noted Japanese snow crystal scholar Ukichiro Nakaya called these "tsusumi crystals" after a traditional Japanese drum of this general shape:
https://mimo-international.com/MIMO/detailstatic.aspx?RSC_BASE=IFD&RSC_DOCID=MINIM_UK_43568&TITLE=/kotsuzumi.  The "yoyo crystals" are even closer in shape to a short, fat tsusumi than the snow crystals pictured above.
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