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Sources:
https://www.gemsociety.org/article/what-is-gemstone-pleochroism/
https://blogs.agu.org/georneys/2011/09/15/geology-word-of-the-week-p-is-for-pleochroism/
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http://www.geo.utexas.edu/courses/347k/redesign/Gem_Notes/Corundum/corundum_main.htm
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https://www.mindat.org/min-4003.html
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http://www.nordskip.com/usambara.html
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Image Sources:
https://en.wikipedia.org/wiki/Diamond#/media/File:Diamond_structure.gif
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https://en.wikipedia.org/wiki/File:Ruby_gem.JPG
https://en.wikipedia.org/wiki/File:Padparadscha_sapphire.jpg
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https://commons.wikimedia.org/wiki/File:Cordierite-den07-06aa.jpg
https://commons.wikimedia.org/wiki/File:Cordierite_-_bevellinged_with_necklace_-_view_on_blue-violet_a-axis.jpg
https://commons.wikimedia.org/wiki/File:Cordierite_-_bevellinged_with_necklace_-_view_on_colorless_b-axis.jpg
https://commons.wikimedia.org/wiki/File:Andalusite_Jewels.jpg
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https://commons.wikimedia.org/wiki/File:Elbaite-278491.jpg
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