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File:Hailstones (11 August 2010) (Elk Park Pass, northeast of Butte, Montana, USA) 4.jpg

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English: Hailstones consisting of cloudy ice, generated by a late afternoon storm on 11 August 2010 at Elk Park Pass, northeast of Butte, Montana, USA. The coin is ~2.1 centimeters in diameter.

Hailstones are scarce, ephemeral, polycrystalline, concentrically layered, monomineralic rocks of meteoric origin. They are composed of the mineral ice (hydrogen oxide, H2O). Ice has a low melting temperature for a mineral (= 0˚ Celsius/Centrigrade; = 32˚ Fahrenheit; = 273˚ Kelvin). As a result, rocks (hailstones, firn, glacial ice) and sedimentary deposits (snow) consisting of ice are ephemeral, except at very high elevations (mountain tops) and in polar to near-polar facies. Hailstones form in many thunderstorms and can reach the land surface before melting. They range in size from about half-a-centimeter to over 20 centimeters (very large hailstones such as: www.flickr.com/photos/75478688@N08/6804952627/in/photostr... and www.flickr.com/photos/74109683@N03/6807753397/in/photostr... are not really hailstones, but are aggregate hailstones, formed by ice cementing many smaller hailstones together). Hailstones form spherical to subspherical to irregularly-shaped masses.

The term "cryometeorites" has been applied to hailstones by some people. Considering that they do not originate from outer space, this term is inappropriate and is rejected here.
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Source https://www.flickr.com/photos/47445767@N05/51003865520/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/51003865520. It was reviewed on 27 March 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

27 March 2021

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current06:07, 27 March 2021Thumbnail for version as of 06:07, 27 March 20212,572 × 1,222 (1.77 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51003865520/ with UploadWizard

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