Editing Crystal (section)

=== Ice ===
Water-based [[ice]] in the form of [[snow]], [[sea ice]], and [[glacier]]s are common crystalline/polycrystalline structures on Earth and other planets.<ref>Yoshinori Furukawa, "Ice"; Matti Leppäranta, "Sea Ice"; D.P. Dobhal, "Glacier"; and other articles in Vijay P. Singh, Pratap Singh, and Umesh K. Haritashya, eds., ''Encyclopedia of Snow, Ice and Glaciers'' (Dordrecht, NE: Springer Science & Business Media, 2011). {{ISBN|904812641X}}, 9789048126415</ref> A single [[snowflake]] is a single crystal or a collection of crystals,<ref>{{Cite book|url=https://books.google.com/books?id=jY9ADAAAQBAJ&q=snowflake+is+usually+single+crystal&pg=PA12|title=The Snowflake: Winter's Frozen Artistry|last1=Libbrecht|first1=Kenneth|last2=Wing|first2=Rachel|date=2015-09-01|publisher=Voyageur Press|isbn=9781627887335|language=en}}</ref> while an [[ice cube]] is a [[polycrystal]].<ref>{{Cite book|url=https://books.google.com/books?id=Drs6DwAAQBAJ&q=ice+cube+polycrystal+snow+is+single+crystal&pg=PA78-IA186|title=Snow Engineering 2000: Recent Advances and Developments|last=Hjorth-Hansen|first=E.|date=2017-10-19|publisher=Routledge|isbn=9781351416238|language=en}}</ref> Ice crystals may form from cooling liquid water below its freezing point, such as ice cubes or a frozen lake. [[Frost]], snowflakes, or small ice crystals suspended in the air ([[ice fog]]) more often grow from a [[supersaturated]] gaseous-solution of water vapor and air, when the temperature of the air drops below its [[dew point]], without passing through a liquid state. Another unusual property of water is that it expands rather than contracts when it crystallizes.<ref>''Nucleation of Water: From Fundamental Science to Atmospheric and Additional Applications'' by Ari Laaksonen, Jussi Malila -- Elsevier 2022 Page 239--240</ref>