Opalized ammonite (IMAGE) Carnegie Science Earth and Planets Laboratory Caption A beautiful example from Alberta, Canada of a biomineral -- an intersection of minerals and life Credit ARKENSTONE/Rob Lavinsky Usage Restrictions Must credit ARKENSTONE/Rob Lavinsky 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.