Titanium in Quartz (IMAGE) Rensselaer Polytechnic Institute Caption The gradient of titanium in quartz is evidence that the mineral crystallized at a cooler temperature than had been previously believed. Credit Rensselaer 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.