File:Narwhal ivory tusk 5 (27104528474).jpg

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Narwhal ivory tusk (public display, Warther Museum, Dover, Ohio, USA)

Ivory is a type of biogenic gem. It is composed of hydrous calcium phosphate-carbonate and comes from the tusks of certain mammals, such as elephants and hippos. Paleoivory is derived from fossil mammoth tusks.

The tusk shown above is from a narwhal, Monodon monoceros Linnaeus, 1758, which is a type of odontocete whale. Narwhal males, and some females, have a long, spiraled, anteriorly-projecting tusk.

Classification: Animalia, Chordata, Vertebrata, Mammalia, Artiodactyla, Cetacea, Odontoceti, Monodontidae

See also:

<a href="https://en.wikipedia.org/wiki/Narwhal" rel="nofollow">en.wikipedia.org/wiki/Narwhal</a>
Date
Source Narwhal ivory tusk 5
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27104528474 (archive). It was reviewed on 10 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 December 2019

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current01:44, 10 December 2019Thumbnail for version as of 01:44, 10 December 20191,089 × 2,995 (2.11 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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