Maybe you've seen pictures of glowing blue lava flows and dismissed them as Photoshop trickery. Healthy skepticism is good, but there really is a volcano in Indonesia where a unique fluke of chemistry creates an eerie blue glow.

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Sources:
http://www.smithsonianmag.com/science-nature/why-does-indonesian-volcano-burn-bright-blue-180949576/?no-ist
http://news.nationalgeographic.com/news/2014/01/140130-kawah-ijen-blue-flame-volcanoes-sulfur-indonesia-pictures/
http://geology.com/volcanoes/kawah-ijen/
https://www.volcanodiscovery.com/ijen.html
http://www.stormchaser.ca/Volcanoes/Kawah_Ijen/Kawah_Ijen.html
http://volcano.si.edu/volcano.cfm?vn=263350
http://www.livescience.com/54012-the-terrifying-threat-from-an-acid-lake.html
http://www.chm.bris.ac.uk/motm/so2/so2c.htm
http://www.sciencedirect.com/science/article/pii/S0377027399001584
https://www.scientificamerican.com/article/why-do-certain-elements-c/
http://chemistry.stackexchange.com/questions/4667/why-do-transition-elements-make-colored-compounds
http://faculty.sites.uci.edu/chem1l/files/2013/11/RDGVISSpec.pdf