Hackmanite (IMAGE) University of Turku Caption Hackmanite turns purple under UV irradiation, and the color fades back to white in a few minutes under regular white light. This sample is from Greenland. Credit Mika Lastusaari 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.