CCC (IMAGE) University of Innsbruck Caption Inconspicuous, but full of valuable information: Cryogenic cave deposits are small crystals that only form under very specific conditions when permafrost thaws. Credit Christoph Spoetl Usage Restrictions None License Licensed 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.