Tugtupite (IMAGE) University of Turku Caption Tugtupite is a rare mineral, which turns pink when exposed to UV radiation. The return back to white takes several hours, because it requires large atomic movements. This sample is from Greenland. Credit Sami Vuori Usage Restrictions Photographer has to be credited. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.