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Behold the dazzling colors of an iridescent ammonite (Placenticeras intercalare)! A relative of today’s squids, this ammonite lived some 80 million years ago near what is now Alberta, Canada. This fossil’s spectacular coloration is the result of millions of years of high temperatures and pressures. As these forces acted on nacre in this ammonite’s shell, it was transformed into a gemstone known as an ammolite. Along with amber and pearl, ammolite is one of only a handful of gems made by living organisms.

You can spot this rare specimen in the Louis V. Gerstner, Jr. Collections Core in the Museum’s Richard Gilder Center for Science, Education, and Innovation! Plan your visit.

Photo: © AMNH 

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igor shcherbakov, litha (2021)

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A natural wave is formed on Lake Michigan when the riptide meets the incoming tide and explodes upward, 2014 - by Michael Bernhardt, American

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Opalised dinosaur femur. Registration no. P 208014.

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Marisol Muro, Kitties recharging with the Moon

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Journal comic. Inktober day 13.

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Darkening sky– thunder in the distance. Martha Lake, Sequoia-Kings Canyon National Parks, SEKI, Sierra Nevada Mountains, California, USA. Photo by Van Miller

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By Dan Zollinger

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