The Rainbow Gem Made from Ancient Sea Creatures

From SciShow.

Ammonite fossils can be found all over world, but in one place, something happened that turned their remains into rainbow-colored gems that are more rare than diamonds!

Hosted by: Michael Aranda

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Sources:

https://www.bgs.ac.uk/discoveringGeology/time/Fossilfocus/ammonite.html
https://www.gia.edu/doc/Iridescent-Fossilized-Ammonite-from-Southern-Alberta-Canada.pdf
https://www.gemsociety.org/article/ammolite-jewelry-gem-information/
https://ags.aer.ca/activities/ammolite.htm