Compound Interest is a British blog through which Andy Brunning, a chemistry teacher with a flair for graphic design, posts outstanding chemistry-themed infographics.
The image above shows sixteen gemstones, their chemical compositions, Mohs hardnesses, and - most interestingly to me - the source of their various colours (note the British spelling, I'm so cultured, donchaknow). In summer camp we cover the idea of crystal defects - primarily toward the mechanical properties imparted with dislocations and subtitutional/interstitial/vacancy defects. Here we get the effects of crystal defects showing up as colours in the various gemstones.
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