Hexagon-shaped mudcracks filled with salt (IMAGE) Indiana University Caption This raw image from the Curiosity Rover shows the hexagon-shaped mudcracks filled with salt. Credit NASA/JPL-CALTECH/MSSS, LANL. Usage Restrictions Credit source 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.