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From corundum to alexandrite, there are rare minerals have multi-colors caused by how they form their structure!

Hosted by: Hank Green

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Sources:
https://www.gemsociety.org/article/wh…
https://blogs.agu.org/georneys/2011/0…
https://nature.berkeley.edu/classes/e…
https://www.gia.edu/gems-gemology/fal…
https://www.sciencedirect.com/topics/…
https://www.mpp.mpg.de/~bangert/Miner…
https://www.gemsociety.org/article/ge…
http://www.geo.utexas.edu/courses/347…
http://minerals.gps.caltech.edu/FILES…
https://www.mindat.org/min-1128.html
https://www.gemsociety.org/article/mi…
https://nature.berkeley.edu/classes/e…
https://www.pizzacraft.com/blogs/pizz…
https://www.gia.edu/iolite-description
https://www.mindat.org/min-217.html
http://minerals.gps.caltech.edu/FILES…
https://link.springer.com/article/10….
http://scienceworld.wolfram.com/chemi…
http://www.webexhibits.org/causesofco…
https://www.gia.edu/doc/Gemstones-wit…
https://www.gemdat.org/gem-109.html
https://www.alexandrite.net/chapters/…
https://www.researchgate.net/publicat…
https://www.mindat.org/min-4003.html
https://www.gia.edu/tourmaline-descri…
https://www.gia.edu/tourmaline-qualit…
http://www.nordskip.com/usambara.html
https://www.cambridge.org/core/servic…

Image Sources:
https://en.wikipedia.org/wiki/Diamond…
https://commons.wikimedia.org/wiki/Fi…
https://en.wikipedia.org/wiki/File:Ru…
https://en.wikipedia.org/wiki/File:Pa…
https://commons.wikimedia.org/wiki/Ca…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Ca…
https://commons.wikimedia.org/wiki/Fi…

https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…
https://en.wikipedia.org/wiki/Alexand…
https://docs.google.com/document/d/1Y…
https://commons.wikimedia.org/w/index…
https://commons.wikimedia.org/wiki/Fi…
https://en.wikipedia.org/wiki/File:El…
https://commons.wikimedia.org/wiki/Fi…
https://commons.wikimedia.org/wiki/Fi…