Dolostone Crystals (IMAGE) California Institute of Technology Caption Crystals of highly carbon-13-depleted carbonate are observed using a light microscope. Credit Thomas Bristow Usage Restrictions With credit as given above 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.