Diatoms (IMAGE) Georgia Institute of Technology Caption Left: This is a map of silicon distribution in a diatom. Right: This is a map of the distribution of iron in the same diatom. Lighter colors indicate higher concentrations. Note how the distribution of iron mirrors the distribution of silicon. Credit Ellery Ingall 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.