Chemistry:Tenebrescence
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Tenebrescence, also known as reversible photochromism, is the ability of minerals to change colour when exposed to light. The effect can be repeated indefinitely, but is destroyed by heating.[1]
Tenebrescent minerals include hackmanite, spodumene and tugtupite.
Tenebrescent behavior is exploited in synthetic materials for the manufacture of self-adjusting sunglasses, which darken on exposure to sunlight.
References
- ↑ Kondo, D.; Beaton, D. (2009). "Hackmanite/Sodalite from Myanmar and Afghanistan". Gems and Gemology 45 (1): 38–43. doi:10.5741/GEMS.45.1.38. https://www.gia.edu/doc/Sodalite-from-Myanmar-and-Afghanistan.pdf.
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